The INA is a card file and online reporting system maintained at the Silva Center for Phycological Documentation of the University Herbarium, University of California, Berkeley. It contains nearly 200,000 names of algae (in the broad sense). The BPU is a card file containing bibliographic references pertaining to algal taxonomy.
A working list of algal type specimens at UC is available here
Results from INA database
| Name | Author | Source | Citation | Year |
|---|---|---|---|---|
| Thoracosphaera crassa | S.E. van Heck & B. Prins | Abh. Geol. B.-A. | 39: 291, pl. 1: fig. 25 | 1987 |
| Microspora fontinalis var. crassa | Lemmermann | Abh. Naturwiss. Ver. Bremen | 14: 247 | 1897 |
| Acrochaetium incrassatum | Ercegović | Acta Adriat. | 8(8): 72, fig. 23 | 1957 |
| Asterocapsa rubra var. crassa | Y.-P. Tian in Tien et al. | Acta Phytotaxonomica Sinica | 39: 282, figs. 5-7 | 2001 |
| Cosmarium variolatum var. incrassatum | A.M. Scott & Grönblad | Acta Soc. Sci. Fenn., Ser. B, Opera Biol. | 2{8}: 23, pl. I: figs. 21-23 | 1957 |
| Cosmarium exiguum f. incrassatum | A.M. Scott & Grönblad | Acta Soc. Sci. Fenn., n.s. B, | 2{8}: 17, pl. 8: figs. 9, 10 | 1957 |
| Pachymenia crassa | Lindauer | Alg. Nov. Zeland. Exsicc.: | 140 | 1947 |
| Melobesia crassa | Lloyd | Alg. Ouest France, | Fasc. 16, no. 318 | 1860 |
| Hydrurus irregularis f. crassus_('crassa') | Rabenhorst | Alg. Sachs. Dec. | 73/74: letterpress to nos. 721-739 | 1858 (Sept.) |
| Navicula major var. crassa | Brébisson in Rabenhorst | Alg. Sachs. Dec. | 69/70: no. 683 | 1858 (May) |
| Oscillaria ornata f. crassa | Rabenhorst | Alg. Sachs. Dec. | 77/78: no. 778 | 1858 (Oct.) |
| Spirogyra crassa var. heeriana | (Nägeli ex Kützing) Kirchner | Alg. Schles.: | 119 | 1878 |
| Halimeda incrassata f. lamourouxii | J. Agardh | Alg. Syst. | 5: 86 | 1887 |
| Halimeda incrassata f. ovata | J. Agardh | Alg. Syst. | 5: 86 | 1887 |
| Botryocladia crassa | J.M. Huisman | Algae of Australia: Marine Benthic Algae of North-western Australia. 2: | 332, fig. 96 | 2018 |
| Staurodesmus convergens var. incrassatus | (Gutwiński) O.A. Petlovany in P.M. Tsarenko et al. (eds.) | Algae of Ukraine | 4: 414 | 2015 |
| Acutodesmus incrassatulus | (Bohlin) P.M. Tsarenko in Tsarenko & Petlevanny | Algologia | (unnumbered supplement): 10 | 2001 |
| Lepocinclis tripteris var. crassa | (Swirenko) D. Kapustin | Algologia | 21: 140 | 2011 |
| Tauya basicrassa | N.G. Klochkova & T.N. Krupnova | Algologiya | 14: 89, fig. 2 | 2004 |
| Cosmarium incrassatum var. brasiliense | K. Förster | Amazoniana | 2: 51, pl. 18: figs. 1, 2 | 1969 |
| Cosmarium pseudoincrassatum | P. Bourrelly & A. Couté | Amazoniana | 7: 248 | 1982 |
| Cosmarium pseudoincrassatum var. brasiliense | (K. Förster) P. Bourrelly & A. Couté | Amazoniana | 7: 248 | 1982 |
| Lithothamnion incrassatum | (Foslie) Jadin | Ann. Cryptog. Exot. | 7: 171 | 1935 |
| Oscillatoria kuetzingiana var. crassa | Woronichin | Arch. Hydrobiol. | 17: 642 | 1926 |
| Anabaena crassa | (Lemmermann) J. Komárková-Legnerová & G. Cronberg | Arch. Hydrobiol. Suppl. | 95 (Algol. Stud. 67): 24 | 1992 |
| Achnanthes crassa | Hustedt | Arch. Hydrobiol. Suppl. | 15: 194, pl. XIII: figs. 37-40 | 1937 |
| Nodularia crassa | (Woronichin) J. Komárek, M. Hübel, H. Hübel, & J. S\*vmarda | Arch. Hydrobiol. Suppl. | 96 (Algol. Stud. 68): 19 | 1993 |
| Planktolyngbya crassa | J. Komárková-Legnerová & G. Cronberg | Arch. Hydrobiol. Suppl. | 95 (Algol. Stud. 67): 22, fig. 1a, pl. 1 | 1992 |
| Synechocystis crassa var. maior | Geitler | Arch. Hydrobiol. Suppl. | 12: 623, no fig. | 1933 |
| Chamaecalyx incrassatus | (Lemmermann) J. Komárek & K. Anagnostidis | Arch. Hydrobiol. Suppl. | 73 (Alg. Stud. 43): 199 | 1986 |
| Glaucocystis nostochinearum var. incrassata | Lemmermann | Arch. Hydrobiol. u. Planktonk. | 4: 178, pl. V: fig. 4 | 1908 |
| Euglena tripteris var. crassa | Swirenko | Arch. Hydrobiol. u. Planktonk. | 10: 325, pl. IV: figs. 12-14 | 1915 |
| Liagora crassa | Levring | Ark. Bot., ser. 2, | 2: 502, figs. 32G,H, 34 | 1953 |
| Involucrana crassa | (J. Hooker & Harvey) E. Gordon | Austral. J. Bot., Suppl. Ser. | 4: 105 | 1972 |
| Curdiea crassa | A.J.K. Millar | Austral. Syst. Bot. | 3: 341, fig. 19 | 1990 |
| Degagnya crassa | (Kützing) Conard | Beih. Bot. Centralbl. | 55A: 189 | 1936 |
| Gomphonema augur var. crassum_('crassa') | J.L. Stone in McLaughlin & Stone | Beih. Nova Hedwigia | 82: 53, pl. 6: fig. 93 | 1986 |
| Cymbella gastroides var. crassa | Grunow | Beitr. Paläont. Österr.-Ung. | 2: 141, pl. XXIX: fig. 28 | 1882 |
| Stichospora crassa | (Philippi) Heydrich | Ber. Deutsch. Bot. Ges. | 19: 274 | 1901 |
| Achnanthes ventralis var. crassa | (C.W. Reimer) Lange-Bertalot in Lange-Bertalot & Krammer | Biblioth. Diatomol. | 18: 155 | 1989 |
| Navicula reichardtiana var. crassa | Lange-Bertalot & G. Hofmann in Lange-Bertalot | Biblioth. Diatomol. | 27: 133, pl. 47: figs. 4-10 | 1993 |
| Achnanthes subcrassa | R. Maillard ex H. Lange-Bertalot & A. Steindorf in Moser, Steindorf, & Lange-Bertalot | Biblioth. Diatomol. | 32: 41 | 1995 |
| Cosmarium norimbergense var. incrassatum | P. Bourrelly & A. Couté | Biblioth. Phycol. | 86: 81, 191, pl. XXVIII: fig. 13 | 1991 |
| Staurodesmus curvirostris var. incrassatus_(`incrassatum') | P. Bourrelly & A. Couté | Biblioth. Phycol. | 86: 122, 195, pl. XLIII: fig. 5 | 1991 |
| Staurastrum prionotum var. incrassatum | P. Bourrelly & A. Couté | Biblioth. Phycol. | 86: 154, 199, pl. LVII: fig. 7 | 1991 |
| Scenedesmus incrassatulus | Bohlin | Bih. K. Svenska Vet.-Akad. Handl. | 23(Afd. III, 7): 24, pl. I: figs. 45-51 | 1897 |
| Gracilaria crassa f. conglomerata | Børgesen | Biol. Meddel. Kongel. Danske Vidensk. Selsk. | 18{19}: 34, figs. 17, 18 | 1952 |
| Amphora crassa f. minor | V. Zanon | Bollettino di pesca, piscicoltura e idrobiologia | 3: 222, text-fig. 4 | 1948 |
| Anabaena spiroides var. crassa | Lemmermann | Bot. Centralbl. | 76: 155 | 1898 |
| Arthrodesmus convergens var. incrassatus | Gutwiński | Bot. Centralbl. | 43: 71 | 1890 |
| Basicladia crassa | W.E. Hoffmann & J.E. Tilden | Bot. Gaz. | 89: 382, figs. 2-22 | 1930 |
| Dermocarpella incrassata | Lemmermann | Bot. Jahrb. | 38: 350, pl. VI: figs. 10-14 | 1907 |
| Porphyra pseudocrassa | Yamada & H. Mikami in Mikami | Bot. Mag. Tokyo | 69: 340, figs. 1, 2 | 1956 |
| Nemastoma dichotomum var. incrassatum | (Kützing) C. Rodríguez-Prieto, M. Verlaque, & A. Vergés in C. Rodríguez-Prieto, A. Vergés, N. Sánchez, L. Polo, & M. Verlaque | Bot. Mar. | 47: 46 | 2004 |
| Austropugetia crassa | R.L. Moe in M.H. Hommersand, R.L. Moe, C.D. Amsler, & S. Fredericq | Bot. Mar. | 52: 524, figs. 3(lower right) | 2009 |
| Pseudanabaena crassa | Vozzhennikova | Bot. Mater. Bot. Inst. Akad. Nauk SSSR, Spor. Rast. | 9: 73, fig. 1:2 | 1953 |
| Halimeda incrassata var. simulans | (Howe) Børgesen | Bot. Tidsskr. | 31: 144 | 1911 |
| Ethelia crassa | D.L. Ballantine, H. Ruíz, Lozada-Troche, & J.N. Norris | Botanica Marina | 60: 647, figs. 11-18 | 2017 |
| Denticulopsis crassa | Y. Yanagisawa & F. Akiba | Bull. Geol. Surv. Japan | 41: 248, pl. 3: figs. 21-27; pl. 12: figs. 1-8 | 1990 |
| Lithothamnion calcareum f. crassum_('crassa') | (Philippi) Me. Lemoine | Bull. Mus. Natl. Hist. Nat. [Paris] | 15: 552 | 1909 [probably early 1910] |
| Cosmarium crassangulatum var. champesianum | Ducellier | Bull. Soc. Bot. Genève, ser. 2, | 10: 13, fig. 2 | 1918 |
| Dudresnaya crassa | M. Howe | Bull. Torrey Bot. Club | 32: 572, pl. 28; pl. 29: figs. 12-26 | 1905 |
| Achnanthes subcrassa | R. Maillard | Cah. O.R.S.T.O.M., Sér. Hydrobiol. | 12: 150, pl. I: fig. 14 | 1979 |
| Lyngbya epiphytica var. crassa | M.T.P. Azevedo & C.L. Sant'Anna | Crypt. Bot. | 3: 207, figs. 10-11 | 1993 |
| Audouinella incrassata | (Ercegović) F. Conde Poyales | Cryptog.: Algol. | 12: 166 | 1991 |
| Gelidiella incrassata | G.H. Boo & L. Le Gall in G.H. Boo et al. | Cryptogamie, Algologie | 36: 234, figs. 3-14 | 2015 |
| Thalassiodianthus incrassatus | G.W. Saunders & G.T. Kraft in Saunders et al. | Cryptogamie, Algologie | 38: 92, figs. 11-20 | 2017 |
| Arthrospira gomontiana var. crassa | (A.B. Gupta) T.V. Desikachary | Cyanophyta: | 192 | 1959 |
| Synedra ulna var. crassa | Østrup | Danske Diat.: | 183, pl. V: fig. 111 | 1910 |
| Euastrum crassangulatum var. biondulatum | E.N. Lacoste in Lacoste et al. | Darwiniana | 27: 123, fig. 17 | 1986 |
| Amphora farcimen var. crassa | M. Peragallo in Peragallo & Peragallo | Denkschr. K. Akad. Wiss. [Wien], Math.-Nat. Kl. | 88: 9, pl. I: fig. 8 | 1911 |
| Navicula hennedyi var. crassa | H. Peragallo & M. Peragallo | Diatomées Marines de France: | pl. XXV: fig. 4 (desc. on p. 139, 1899) | 1898 |
| Nitzschia lanceolata var. incrassata | H. Peragallo & M. Peragallo | Diatomées Marines de France: | pl. LXXIII: fig. 22 (desc. on p. 285, 1901) | 1900 |
| Cymbella crassa | (Grunow) K. Krammer | Diatoms of Europe | 3: 122 | 2002 |
| Devaleraea marginicrassa | (I.K. Lee) A.V. Skriptsova & T.L. Kalita | Eur. J. Phycol. | 55: 270 | 2020 |
| Eudesme pseudocrassa | H. Kawai, K. Takeuchi & T. Hanyuda in Kawai et al., | European Journal of Phycology | 58: 473, figs. 10-14 | 2023 |
| Xanthidium biincrassatum | K. Thomasson | Exploration hydrobiologique du bassin du lac Bangweolo et du Luapula | 4(2): 25, pl. I: fig. 9; pl. VIII: fig. 9; pl. XV: fig. 8 | 1966 |
| Xanthidium biincrassatum f. triquetrum | K. Thomasson | Exploration hydrobiologique du bassin du lac Bangweolo et du Luapula | 4(2): 25, pl. I: figs. 10, 11; pl. VIII: figs. 4-8 | 1966 |
| Jania crassa | Lamouroux | Exposition méthodique des genres de l'ordre des Polypiers ...: | 23, pl. 69: figs. 9, 10 | 1821 |
| Tetradesmus incrassatulus | (Bohlin) M.J. Wynne in Wynne & Hallan | Feddes Repert. | 127: 84 | 2016 |
| Cylindrocystis crassa var. skujae | H. Croasdale in H. Croasdale & E.A. Flint | Fl. New Zealand: Desmids | 1: 35, pl. 1: fig. 24 | 1986 |
| Cosmarium crassangulatum var. ellipticum | (Grönblad) Krieger & Gerloff | Gatt. Cosmarium: | 32 | 1962 |
| Cosmarium incrassatum | (F.E. Fritsch & M.F. Rich) W. Krieger & J. Gerloff | Gattung Cosmarium: | 19 | 1962 |
| Ectocarpus confervoides f. crassus_(`crassa') | Kjellman | Handb. Skand. Hafsalgfl.: | 77 | 1890 |
| Halimeda incrassata | (Ellis) Lamouroux | Histoire des polypiers coralligènes flexibles, vulgairement nommés zoophytes: | 307 | 1816 |
| Calothrix crustacea var. crassa | S.M.F. Silva | Hoehnea | 18{1}: 115, figs. 35-37 | 1992 |
| Buryatia crassa | M.S. Kulikovskiy, D. Metzeltin, & H. Lange-Bertalot in Kulikovskiy et al. | Iconogr. Diatomol. | 23: 52, pl. 92: fig. 26 | 2012 |
| Staurosira crassa | (Metzeltin & Lange-Bertalot) F. García-Rodriguez, H. Lange-Bertalot, & D. Metzeltin in D. Metzeltin et al. | Iconogr. Diatomol. | 15: 270 | 2005 |
| Fragilaria crassa | D. Metzeltin & H. Lange-Bertalot in H. Lange-Bertalot (ed.) | Iconographia Diatomologica | 5: 89, pl. 1: figs. 20-23; REM-pl. 2: fig. 1 | 1998 |
| Nodularia spumigena var. crassa | Woronichin in Woronichin & Khakhina | Izv. Glavn. Bot. Sada SSSR [Bull. Jard. Bot. Princ. URSS] | 28: 159, fig. 9 | 1929 |
| Oscillatoria deflexa var. crassa | Woronichin | Izv. Glavn. Bot. Sada SSSR [Bull. Jard. Bot. Princ. URSS] | 28: 38 | 1929 |
| Micrasterias tropica var. crassa_('crassum') | W. West & G.S. West | J. Bot. (London) | 35: 87, pl. 366: fig. 3 | 1897 |
| Padina crassa | Yamada | J. Fac. Sci. Hokkaido Univ., Ser. V (Bot.), | 1: 67, pl. XVII: fig. 2 | 1931 |
| Palmaria marginicrassa | I.K. Lee | J. Fac. Sci. Hokkaido Univ., Ser. V (Bot.), | 11: 48, pl. II:D-E, test-figs. 18-22 | 1978 |
| Porphyra crassa | Ueda | J. Imp. Fish. Inst. [Tokyo] | 28: 13 (key), 27, pl. I: 9, 10; pl. VI: 1-7; pl. XVIII: 1 | 1932 |
| Liagora crassa | Dickie | J. Linn. Soc. [London], Bot. | 14: 195 | 1874 |
| Pyropia crassa | (Ueda) N. Kikuchi & M. Miyata in J.E. Sutherland et al. | J. Phycol. | 47: 1143 | 2011 |
| Arnoldiella crassa | (W.E. Hoffmann & J.E. Tilden) C. Boedeker in C. Boedeker et al. | J. Phycol. | 48: 821 | 2012 |
| Kraftalia crassa | (A.J.K. Millar & G.T. Kraft) L. Lagourgue & C. Payri | J. Phycol. | 57: 1465 | 2021 |
| Spirulina gomontiana var. crassa | A.B. Gupta | J. Res. Dayanand Anglo-Vedic Coll., Kanpur | 3{1}: 78 | 1956 |
| Ulva crassa | V.J. Chapman | Journal of the Linnean Society of London, Botany | 55: 391, text-fig. 35-I; pl. 25 | 1956 |
| Anabaena incrassata | G. Nygaard in Berg & Nygaard | K. Danske Vidensk. Selsk. Naturvidensk. og Math. Afd. 9.Raekke | 1: 280, fig. 13, pl. V: fig. 11 | 1929 |
| Lithophyllum incrassatum | (Foslie) Foslie | K. Norske Vid. Selsk. Skr. | 1909{2}: 18 | 1909 |
| Lithophyllum incrustans f. incrassatum_('incrassata') | Foslie | K. Norske Vid. Selsk. Skr. | 1899{5}: 29 | 1900 |
| Lithophyllum racemus f. crassum_('crassa') | (Philippi) Foslie | Kongel. Norske Vidensks. Selsk. Skr. [Trondheim] | 1898{3}: 9 | 1898 |
| Wrangelia crassa | J. Hooker & Harvey | London J. Bot. | 6: 410 | 1847 |
| Tinocladia crassa | (Suringar) Kylin | Lunds Univ. A\*orsskr., N.F., Avd. 2, | 36{9}: 34 | 1940 |
| Jania micrarthrodia var. crassa | (Lamouroux) Areschoug ex H.W. Johansen in Abbott & Hollenberg | Mar. Alg. California: | 419 | 1976 |
| Microchaete crassa | G.S. West | Mém. Soc. Neucha\*^teloise Sci. Nat. | 5, part 2: 1017, fig. 1 | 1914 |
| Cosmarium contractum var. incrassatum | K. Förster | Mitt. Naturw. Arbeitskr. Kempten | 7: 48, pl. 1: fig. 11 | 1963 |
| Achnanthes sublaevis var. crassa | C.W. Reimer in Patrick & Reimer | Monogr. Acad. Nat. Sci. Philadelphia | 13: 262, pl. 17: figs. 5, 6 | 1966 |
| Oscillatoria kuetzingiana f. crassa | (Woronichin) Elenkin | Monogr. Alg. Cyanophyc., Pars. Spec. | 2: 1328 | 1949 |
| Mesogloia crassa | Suringar | Mus. Bot. Leide | 1: 85, pls. 31-33 | 1873 |
| Halimeda incrassata var. monile_('monilis') | (Ellis & Solander) Harvey | Ner. bor.-amer. | 3: 24 | 1858 |
| Griffithsia coacta var. crassa | Okamura | Nippon kaiso\*^ shi [Descriptions of Japanese algae]: | 719, no fig. | 1936 |
| Valeriella incrassata | (Chantanachat & H.C. Bold) T. Darienko & T. Pröschold | Notulae Algarum | 251: 3 | 2022 |
| Cosmarium exiguum var. incrassatum | (A.M. Scott & Grönblad) M.A. Santos & C.W.N. Moura in Ramos et al. | Notulae algarum | 146: 2 | 2020 |
| Lyrella hennedyi var. crassa | (H. Peragallo & M. Peragallo) D.A. Siqueiros-Beltrones in Siqueiros-Beltrones et al. | Notulae algarum | 169: 1 | 2020 |
| Trachelomonas crassata var. oblonga | (Playfair) Deflandre ex R.A. Townsend & J.M. Huisman | Notulae algarum | 203: 24 | 2021 |
| Trachelomonas crassata var. rotunda | (Playfair) Deflandre ex R.A. Townsend & J.M. Huisman | Notulae algarum | 203: 24 | 2021 |
| Cylindrocystis crassa var. itirapinensis_(`itirapinense') | C.E.M. Bicudo | Nova Hedwigia | 17: 440, pl. 116(4): figs. 17-20 | 1969 |
| Oedogonium incrassatum var. tenerrimum | Islam | Nova Hedwigia | 27: 924, pl. 5: figs. 42-43 | 1976 |
| Oscillatoria gomontiana var. crassa | (A.B. Gupta) B. Tracanna | Opera Lilloana | 35: 20 | 1985 |
| Trachelomonas intermedia f. crassa_(`crassus') | B. Tracanna | Opera Lilloana | 35: 46, 127, pl. 17: fig. 7 | 1985 |
| Herposiphonia crassa | Hollenberg | Pacific Sci. | 22: 539, figs. 12, 13 | 1968 |
| Corallina incrassata | Ellis | Philosophical Transactions [Royal Society of London] | 57: 408, pl. XVII: figs. 20-27 | 1768 |
| Spirogyra crassa | (Kützing) Kützing | Phyc. gen.: | 280 | 1843 |
| Gymnophlaea incrassata | Kützing | Phycol. General.: | 390 | 1843 |
| Cosmarium pseudovariolatum var. incrassatum | (A.M. Scott & Grönblad) Y. Kanetsuna | Phycol. Res. | 52: 163 | 2004 |
| Chaetomorpha crassa | (C. Agardh) Kützing | Phycol. germ. | 204 | 1845 |
| Rhipilia crassa | A.J.K. Millar & G.T. Kraft | Phycologia | 40: 32, figs. 37-40, 53-58 | 2001 |
| Ulvella aequicrassa | R. Nielsen in Nielsen et al. | Phycologia | 52: 41, figs. 2-5 | 2013 |
| Lobophora crassa | Z. Sun, P.E. Lim & H. Kawai in Sun et al. | Phycologia | 51: 507, figs. 14-18 | 2012 |
| Sphaerospermopsis crassa | X. Li & R. Li in Li et al. | Phycologia | 56: 149, figs. 1-7 | 2016 |
| Saundersella crassa | H. Kawai, Yuki Watanabe & T. Hanyuda | Phycologia | 60: 280, figs. 3, 6-11 | 2021 |
| Corallina crassa | (Lamouroux) Collins in Collins, Holden, & Setchell | Phycoth. Bor.-Amer.: | 500 | 1898 |
| Hippodonta crassa | A. Pavlov, Z. Levkov, D.M. Williams & M. Edlund | Phytotaxa | 90: 22, figs. 276-290 | 2013 |
| Stephanocha polyactis var. crassa | (D. Bukry) K. McCartney & R.W. Jordan in Jordan & McCartney | Phytotaxa | 201: 180 | 2015 |
| CRASSA | C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 10 | 2018 |
| Crassa cornea | (J. Agardh) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 10 | 2018 |
| Crassa changii | (B.M. Xia & I.A. Abbott) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 10 | 2018 |
| Crassa caudata | (J. Agardh) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 10 | 2018 |
| Crassa crassissima | (P. Crouan & H. Crouan) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 10 | 2018 |
| Crassa truncata | (G.T. Kraft) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 11 | 2018 |
| Crassa usneoides | (C. Agardh) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 11 | 2018 |
| Crassa birdiae | (E. Plastino & E.C. Oliveira) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 11 | 2018 |
| Crassa crouaniorum | (G.M. Lyra, J.C.M. Nunes & C.C. Davis) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 11 | 2018 |
| Crassa secundata | (Harvey) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 11 | 2018 |
| Crassa punctata | (Okamura) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 11 | 2018 |
| Crassa firma | (C.F. Chang & B.M. Xia) C.F.D. Gurgel, J.N. Norris & S. Fredericq | Phytotaxa | 374: 11 | 2018 |
| Micrasterias robusta var. crassa | (W. West & G.S. West) P.F.M. Coesel & A. Van Geest | Plant Ecology and Evolution | 147: 395 | 2014 |
| Synedra ulna var. crassa | Pantocsek | Pozsyonyi Orvos-Termeszettudomanyi Egyesulet Kozlemenyei | 23: 29, pl. II: fig. 48 | 1913 |
| Romeria crassa | F. Hindák | Preslia | 60: 299, fig. 5 | 1988 |
| Oscillatoria crassa | (C.B. Rao) K. Anagnostidis | Preslia | 73: 372 | 2001 |
| Koliella crassa | F. Hindák | Preslia | 56: 10, fig. 5 | 1984 |
| Oscillatoria subbrevis f. crassa | S. Dixit | Proc. Indian Acad. Sci., Sect. B, | 3: 103, no fig. | 1936 |
| Oscillatoria ornata var. crassa | C.B. Rao | Proc. Indian Acad. Sci., sect B, | 8: 165, fig. 2D | 1938 |
| Synedra ulna var. crassa | G.S. Venkataraman | Proc. Natl. Inst. Sci. India, Biol. Sci. | 23: 80, fig. 13 | 1957 |
| Euastrum crassangulatum var. glabrum | W. Krieger | Rabenhorst's Krypt.-Fl. Deutschl., 2.Aufl., | 13(1,4): 547, pl. 74: figs. 21, 22 | 1937 |
| Actinocyclus ehrenbergii var. crassus_('crassa') | (W. Smith) Hustedt | Rabenhorst's Krypt.-Fl. Deutschland | 7{1}: 529 | 1929 |
| Mastogloia aspera var. crassa | M. Ricard | Rev. Algol., ser. 2 | 11: 163, pl. 4: fig. 1 | 1974 |
| Crassapontosphaera jonesii_(`jonesi') | J.E. Boudreaux & W.W. Hay | Rev. Espan\*~. Micropaleontol. | 1: 273, pl. V: figs. 14-19 | 1969 |
| Arthrodia crassa | (Rabenhorst) Kuntze | Rev. Gen. Pl. | 2: 883 | 1891 |
| Conjugata crassa | (Kützing) Kuntze | Rev. Gen. Pl. | 2: 889 | 1891 |
| Porphyra amplissima f. crassa | S. Kawabata | Sci. Pap. Inst. Algol. Res. Fac. Sci. Hokkaido Imp. Univ. | 1: 208 | 1936 |
| Campylaephora crassa f. borealis | Y. Nakamura | Sci. Pap. Inst. Algol. Res., Hokkaido Univ. | 3: 170 | 1950 |
| Campylaephora crassa f. cymosa | Nakamura | Sci. Pap. Inst. Algol. Res., Hokkaido Univ. | 3{2}: 168, fig. 7 | 1950 |
| Glaucocystis incrassata | (Lemmermann) Tos. Takahashi & Nozaki in Takahashi et al. | Scientific Reports | 6:29209, 7 | 2016 |
| Halimeda incrassata f. monile_('monilis') | (Ellis & Solander) Barton | Siboga-Exped. | 60: 27 | 1901 |
| Amphiroa crassa f. minuta | Weber-van Bosse | Siboga-Exped. Monogr. | 61: 98, pl. XV: fig. 3 | 1904 |
| Halimeda incrassata f. rotunda | Barton | Siboga-Exped. Monogr. | 60: 28, pl. IV: fig. 45 | 1901 |
| Gracilaria crassa | Harvey ex J. Agardh | Sp. Alg. | 3{1}: 417, no fig. | 1876 |
| Farlowia crassa | J. Agardh | Sp. alg. | 3{1}: 262, no fig. | 1876 |
| Spirogyra crassa f. heeriana | (Nägeli ex Kützing) Petit | Spir. Paris: | 32 | 1880 |
| Navicula reichardtiana var. crassa | Lange-Bertalot & G. Hofmann in Krammer & Lange-Bertalot in H. Ettl et al. (eds.) | Süsswasserfl. Mitteleuropa | 2{4}: pl. 68: figs. 16-19 | 1991 |
| Asterocytis ramosa var. crassa | (Hansgirg) Forti in De Toni | Syll. Alg. | 5: 690 | 1907 |
| Staurastrum crassangulatum | P.F.M. Coesel | Syst. Geogr. Pl. | 77: 10 | 2007 |
| Conferva crassa | C. Agardh | Systema algarum: | 99 | 1824 |
| Spongites crassus_('crassa') | (Philippi) Kützing | Tab. Phycol. | 19: 35 | 1869 |
| Xanthidium tirthalliense f. incrassatum | G.R. Hegde & S.W. Isaacs | The Journal of the Bombay Natural History Society | 86: 90, fig. 4 | 1989 |
| Lithothamnion gibbosum f. crassum_('crassa') | Foslie | Trans. Linn. Soc. London, Bot. | 7: 100 | 1907 |
| Cosmarium pseudopachydermum var. incrassatum_(`incrassata') | F.E. Fritsch & M.F. Rich | Trans. Roy. Soc. South Africa | 25: 193, fig. 16 A, B | 1937 |
| Hantzschia crassa var. obtusa | Wislouch & Poretzky in Poretzky | Trudy Leningradskago Obschchestva Estestvoispytatelei | 53(3): 148, fig. 12 | 1924 |
| Epithemia sorex var. crassa | D.O. Svirenko | Trudy Vseukrainskoi Gosudarstvennoi Chernomorsko-Azovskoi Nauchno-Promyslovoi Opytnoi Stantsii | 1: 214, fig. 11 | 1925 |
| Chlorospira crassa | Korshikov | Uchen. Zap. Gor'kovsk. Gosud. Univ. | 9: 119, 126, fig. 20 | 1939 |
| Spongiochloris incrassata | Chantanachat & H.C. Bold | Univ. Texas Publ. | 6218: 27, figs. 29-35, 93-96 | 1962 |
| Amphora crassa var. interrupta | J.-M. Lin & T.G. Chin | Universitatis Amoiensis, Acta Scientiarum Naturalium | 19(4): 109, fig. C | 1980 |
| Nostoc muscorum f. crassum_('crassa') | G.H. Schwabe | Verh. Dt. Wiss. Verein, Santiago de Chile | 3: 128, fig. 8 | 1936 |
| Euastrum crassangulatum var. carniolicum | Lütkemüller | Verh. K. Zool.-Bot. Ges. Wien | 50: 73, pl. I: figs. 20-22 | 1900 |
| Binuclearia lauterbornii var. crassa | A.I. Proshkina-Lavrenko & I.V. Makarova | Vodor. Plankt. Kaspijsk. Morya: | 262, fig. 77: 4, 5 | 1968 |
| Porphyra inaequicrassa | L.P. Perestenko | Vodorosli Zaliva Petra Velikogo: | 29 (key), 31, 193, figs. 27, 28 | 1980 |
| Amphiroa crassa | Lamouroux in Quoy & Gaimard | Voyage autour du monde ... exécuté sur les corvettes de S.M. l'Uranie et la Physicienne, pendant les années 1817, 1818, 1819 et 1820: | 627 | 1824 |
| Ceratium flagelliferum var. crassum_('crassa') | G. Karsten | Wiss. Ergeb. Deutsch. Tiefsee-Exped. 1898-1899, | 2{2}: 406, pl. XLIX: fig. 25 | 1907 |
| Ceratium macroceros var. crassum_('crassa') | G. Karsten | Wiss. Ergeb. Deutsch. Tiefsee-Exped. 1898-1899, | 2{2}: 411, pl. XLIX: fig. 27a,c,e | 1907 |
| Achnanthes crassa var. elliptica | Suxena & Venkateswarlu | image | ||
| Achnanthes pusilla var. crassa | (Hustedt) Lange-Bertalot & Ruppel | image | ||
| Aclistochara crassa | (Dollfus & Fritel) Grambast & Grambast | image | ||
| Acrochaetium incrassatum | A. Ercegovic | image | ||
| Acrosiphonia incurva f. crassa | Perestenko | image | ||
| Acrothrix pacifica f. crassa | Inagaki | image | ||
| Actinastrum aciculare f. crassapicatum | (G.E. Huber-Pestalozzi) P. Compère | image | ||
| Actinastrum schroeteri var. crassapicatum_('crassapicata') | G.E. Huber-Pestalozzi | image | ||
| Alsidium tenuissimum f. crassum_('crassa') | Crouan fr. | image | ||
| Amphiroa crassa f. godeffroyi | (Grun.) Weber-van Bosse | image | ||
| Amphora crassa var. antarctica | Peragallo | image | ||
| Amphora crassa var. campechiana | A. Grunow | image | ||
| Amphora crassa var. degenerata | P.T. Cleve | image | ||
| Amphora crassa var. elongata | P.T. Cleve | image | ||
| Amphora crassa var. euprepes | J. Pantocsek | image | ||
| Amphora crassa var. gemmata | A. Jurilj | image | ||
| Amphora crassa var. incurva | A. Grunow | image | ||
| Amphora crassa var. interlineata | (Grove & G. Sturt) P.T. Cleve | image | ||
| Amphora crassa var. minor | J. Pantocsek | image | ||
| Amphora crassa var. modesta | P.T. Cleve | image | ||
| Amphora crassa var. oceanica | H. Heiden | image | ||
| Amphora crassa var. punctata | A. Grunow | image | ||
| Amphora crassa var. seychellensis | P.T. Cleve | image | ||
| Amphora crassa var. soelswigiensis | (P.C.M. Petit) P.T. Cleve | image | ||
| Amphora crassa var. spuria | P.T. Cleve | image | ||
| Amphora crassa | W. Gregory | image | ||
| Amphora incrassata | M.H. Giffen | image | ||
| Amphora virgata var. crassa | M. Peragallo | image | ||
| Anabaena circinalis var. crassa | Ghose | image | ||
| Anabaena crassa | (Lemmermann) J. Komárková-Legnerová & G. Cronberg | image | ||
| Anabaena incrassata var. major | Teiling | image | ||
| Anabaena macrospora var. crassa | Klebahn | image | ||
| Anabaena oscillarioides var. crassa | Playfair | image | ||
| Anabaena oscillarioides var. crassa | Vasishta | image | ||
| Anabaena unispora var. crassa | C.B. Rao | image | ||
| Anabaena variabilis f. crassa | Woronichin | image | ||
| Anabaena variabilis | Kützing crassa Woronichin | image | ||
| Anabaena volzii var. crassa | (Rao) Bourrelly | image | ||
| Aphanocapsa crassa | Ghose | image | ||
| Aphanothece stagnina f. crassa | Tiwari | image | ||
| Aphroporella crassa | Gnilovskaya | image | ||
| Arthrodesmus arcuatus var. incrassatus | Scott & Prescott | image | ||
| Arthrodesmus curvatus var. incrassatus | Scott & Prescott | image | ||
| Arthrodesmus incrassatus | Lagerheim | image | ||
| Arthrodesmus incrassatus var. cycladatus | Lagerheim | image | ||
| Arthrodesmus subulatus f. incrassatus | Scott & Prescott | image | ||
| Arthrodesmus validus var. incrassatus | Scott & Grönblad | image | ||
| Astasia crassa | L.E.G. Fromentel | image | ||
| Audouinella incrassata | (A. Ercegovic) F. Conde Poyales | image | ||
| Aulosira bombayensis f. crassa | Laloraya & Mitra | image | ||
| Aulosira implexa var. crassa | Dixit | image | ||
| Bacillaria incrassata | K.E. Eichwald | image | ||
| Ballia crassa | (C. Agardh) Kützing | image | ||
| Brachtia crassa | (Naccari) Trevisan | image | ||
| Brachychara crassa | (Dollfus & Fritel) L. Grambast & N. Grambast | image | ||
| Brevichara crassa | (Dollfus & Fritel) Horn af Rantzien | image | ||
| Bulbochaete crassa | Pringsheim | image | ||
| Bulbochaete monile var. crassa | Gonzalves & Sonnad | image | ||
| Bumilleriopsis incrassata | Pascher | image | ||
| Buthotrephis gracilis var. crassa | J. Hall | image | ||
| Caloneis crassa | (Gregory) R. Ross | image | ||
| Calothrix fusca var. crassa | C.S. Rao | image | ||
| Calothrix marchica var. crassa | C.B. Rao | image | ||
| Campylaephora crassa | (Okamura) Okamura | image | ||
| Campylaephora crassa f. australis | Itono | image | ||
| Campylaephora crassa f. borealis | Nakamura | image | ||
| Campylaephora crassa f. elongata | Nakamura | image | ||
| Campylaephora crassa f. typica | Nakamura | image | ||
| Carinolithus superbus var. incrassatus | Prins | image | ||
| Castagnea crassa | (Suringar) Kuckuck | image | ||
| Cerasterias raphidioides var. incrassata_('incrassatum') | Reinsch | image | ||
| Ceratium flagelliferum var. crassum_('crassa') | Karsten | image | ||
| Ceratium macroceros var. crassum_('crassa') | Karsten | image | ||
| Ceratium tripos f. crassum_('crassa') | Karsten | image | ||
| Chaetomorpha crassa | (C. Agardh) Kützing | image | ||
| Chaetomorpha crassa | (C. Agardh) Kützing | image | ||
| Chaetomorpha crassa f. genuina | Schiffner | image | ||
| Chaetomorpha crassa f. tenuior | Schiffner | image | ||
| Chaetophora endiviifolia var. crassa | C. Agardh | image | ||
| Chaetophora endiviifolia var. crassa | Kützing | image | ||
| Chaetophora incrassata | (Hudson) Hazen | image | ||
| Chaetophora incrassata f. clavata | Gauthier-Lièvre | image | ||
| Chaetophora incrassata f. clavata | Printz | image | ||
| Chaetophora incrassata f. crassa | Gauthier-Lièvre | image | ||
| Chaetophora incrassata f. crassa | Printz | image | ||
| Chaetophora incrassata f. crystallophora | Printz | image | ||
| Chaetophora incrassata f. draparnaldioides | (Wittrock & Nordstedt) F.S. Collins | image | ||
| Chaetophora incrassata f. draparnaldioides | Gauthier-Lièvre | image | ||
| Chaetophora incrassata f. draparnaldioides | Hurter | image | ||
| Chaetophora incrassata f. draparnaldioides | Printz | image | ||
| Chaetophora incrassata f. genuina | Printz | image | ||
| Chaetophora incrassata f. incrustans | Gauthier-Lièvre | image | ||
| Chaetophora incrassata f. incrustans | Printz | image | ||
| Chaetophora incrassata f. linearis | Gauthier-Lièvre | image | ||
| Chaetophora incrassata f. linearis | Printz | image | ||
| Chaetophora incrassata f. polyclados | Printz | image | ||
| Chaetophora incrassata | Schousboe | image | ||
| Chaetosphaeridium globosum f. incrassatum_('incrassata') | Klebahn | image | ||
| Champia tasmanica var. incrassata | J.G. Agardh | image | ||
| Chara crassa | Dollfus & Fritel | image | ||
| Chara fragilis var. crassa | Kützing | image | ||
| Characiochloris crassa | Korshikov | image | ||
| Characiochloris incrassata | Skuja | image | ||
| Characiopsis incrassata | Pascher | image | ||
| Characiopsis pyriformis f. incrassata | (Pascher) Dedusenko-Shchegoleva | image | ||
| Characiopsis pyriformis var. incrassata | Pascher | image | ||
| Chlamydomonadopsis incrassata | (Skuja) Fott | image | ||
| Chlamydomonas crassa | H.R. Christen | image | ||
| Chlamydomonas incrassata | A.A. Pascher | image | ||
| Chlamydomonas incrassata | R. Brabez | image | ||
| Chlamydomonas noctigama var. crassa | H. Ettl | image | ||
| Chlorangium incrassatum | (H.L. Skuja) H. Ettl | image | ||
| Chlorococcum humicola var. incrassata | Fritsch & John | image | ||
| Chloromonas crassa | (Christen) Gerloff & Ettl | image | ||
| Chloromonas incrassata | (Pascher) Ettl | image | ||
| Chloromonas incrassata | Korschikoff | image | ||
| Chodatella ciliata f. crassa | Hortobagyi | image | ||
| Chondria incrassata | (J. Agardh) Gordon-Mills & Womersley | image | ||
| Chondria purpurascens var. incrassata | (Müller) Greville | image | ||
| Chondriopsis tenuissima f. crassa | (Crouan fr.) Croun fr. | image | ||
| Chromulina crassa | Bachmann | image | ||
| Chroococcus minimus var. crassa | C.S. Rao | image | ||
| Chroolepus aureus var. incrassatus | Kützing | image | ||
| Cladophora minima f. crassa | Sakai | image | ||
| Cladophora okadae f. crassa | (Sakai) Sakai & Yoshida | image | ||
| Closterium baillyanum f. crassum_('crassa') | T.J.C. Irenee-Marie | image | ||
| Closterium didymotocum f. crassa | R.L. Grönblad | image | ||
| Closterium ehrenbergii f. percrassa | R.L. Grönblad | image | ||
| Closterium incrassatum | R. Gutwinski | image | ||
| Closterium incrassatum | R. Gutwinski | image | ||
| Closterium pritchardianum f. crassa | R. Gutwinski | image | ||
| Closterium pritchardianum f. crassa | R. Gutwinski | image | ||
| Coccochloris crassa | (Naccari) Meneghini | image | ||
| Codium adhaerens var. incrassatum | Dellow | image | ||
| Codium incrassatum | P.C. Silva ined. | image | ||
| Coeloclonium incrassatum | J. Agardh | image | ||
| Coleochaete orbicularis f. crassa | Y. Bharadwaja | image | ||
| Conferva amoena var. crassa | Schmidle | image | ||
| Conferva crassa | Schousboe | image | ||
| Conferva crassa var. chalybaea | Biasoletto | image | ||
| Conferva incrassata | Bory | image | ||
| Conferva incrassata | Bosc | image | ||
| Conjugata crassa | (Kützing) Kuntze | image | ||
| Corallina crassa | Esper | image | ||
| Corallina crassa | Ishijima | image | ||
| Corallina incrassata | Ellis & Solander | image | ||
| Cosmarium circulare var. crassangulatum | Messikommer | image | ||
| Cosmarium clepsydra var. incrassatum | Therezien | image | ||
| Cosmarium contractum var. incrassatum | Förster | image | ||
| Cosmarium contractum var. incrassatum | Scott & Prescott | image | ||
| Cosmarium crassangulatum | Borge | image | ||
| Cosmarium crassangulatum f. granulatum | Hegde | image | ||
| Cosmarium crassangulatum f. truncatum | Scott & Prescott | image | ||
| Cosmarium crassangulatum var. triverrucosum | Krieger | image | ||
| Cosmarium cymatopleurum var. incrassatum_('incrassata') | Borge | image | ||
| Cosmarium exiguum f. incrassatum | Scott & Grönblad | image | ||
| Cosmarium granatum f. crassum_('crassa') | Roll | image | ||
| Cosmarium incrassatoplicatum | Hinode | image | ||
| Cosmarium incrassatum | (F.E. Fritsch & F. Rich) | image | ||
| Cosmarium incrassatum | Playfair | image | ||
| Cosmarium incrassatum var. amazonense | Förster | image | ||
| Cosmarium incrassatum var. brasiliense | Förster | image | ||
| Cosmarium incrassatum var. schmidlei | (Printz) Krieger & Gerloff | image | ||
| Cosmarium lundellii f. crassangulatum | Scott & Prescott | image | ||
| Cosmarium ocellatum var. incrassatum | West & West | image | ||
| Cosmarium pachydermum var. incrassatum | Scott & Grönblad | image | ||
| Cosmarium perforatum var. crassangulatum | Insam & Krieger | image | ||
| Cosmarium pseudoincrassatum | P. Bourrelly & A. Couté | image | ||
| Cosmarium pseudoincrassatum var. brasiliense | (K. Förster) P. Bourrelly & A. Couté | image | ||
| Cosmarium pseudooctangulare var. incrassatum | Förster | image | ||
| Cosmarium pseudopachydermum var. incrassatum | F.E. Fritsch & Rich | image | ||
| Cosmarium pseudorectangulare var. incrassatum | Förster | image | ||
| Cosmarium rectangulare var. incrassatum | Jao | image | ||
| Cosmarium retusiforme var. incrassatum | Gutwinski | image | ||
| Cosmarium speciosum var. incrassatum | Insam & Krieger | image | ||
| Cosmarium sulcatum var. incrassatum | West & West | image | ||
| Cosmarium thwaitesii var. incrassatum_('incrassata') | Wille | image | ||
| Cosmarium thwaitesii var. subincrassatum | Gutwinski | image | ||
| Cosmarium tjibenongense var. incrassatum_('incrassata') | Bourrelly | image | ||
| Cosmarium turgidum f. crassum_('crassa') | Milovanovic | image | ||
| Cosmarium variolatum var. incrassatum | Scott & Grönblad | image | ||
| Cosmarium venustum f. incrassatum_('incrassata') | Ducellier | image | ||
| Cosmarium venustum f. incrassatum_('incrassata') | W. West | image | ||
| CRASSAPONTOSPHAERA | Boudreaux & Hay | image | ||
| Crassapontosphaera jonesii_('jonesi') | J.E. Boudreaux & W.W. Hay | image | ||
| Crodelia incrustans f. crassa | (Rosanoff) Heydrich | image | ||
| Cylindrocystis crassa | De Bary | image | ||
| Cylindrocystis crassa f. minor | Förster | image | ||
| Cylindrocystis crassa f. minor | Huber-Pestalozzi | image | ||
| Cylindrocystis crassa f. simplex | Gain | image | ||
| Cylindrocystis crassa f. tenuis | Hodgetts | image | ||
| Cylindrocystis crassa var. elliptica_('ellipticum') | West & West | image | ||
| Cylindrocystis crassa var. itirapinensis_('itirapinense') | C. Bicudo | image | ||
| Cymatopleura solea var. crassa | Meister | image | ||
| Cymbella aspera var. crassa | (Grunow) Cleve | image | ||
| Cymbella cistula var. crassa | (Grunow) Cleve-Euler | image | ||
| Cymbella gallica var. crassa | R. d'Aubert | image | ||
| Cymbella incrassata | (Kützing) Brebisson & Godey | image | ||
| Cymbella incrassata | Foged | image | ||
| Cymbella microcephala var. crassa | Reimer | image | ||
| Cystodinium closterium var. crassa | Bourrelly | image | ||
| Cystoseira spicata subsp. crassa | Ercegovic | image | ||
| Dasya coccinea var. crassa | (J. Agardh) J. Agardh | image | ||
| Dasya crassa | J. Agardh | image | ||
| Degagnya crassa | (Kützing) Conard | image | ||
| Delesseria crenata var. incrassata | (Turner) Ruprecht | image | ||
| Delesseria hypoglossum var. incrassata | (Turner) Ruprecht | image | ||
| Delesseria sinuosa var. incrassata | (Turner) S.F. Gray | image | ||
| Dermocarpa incrassata | (Lemmermann) Geitler | image | ||
| Dermocarpa incrassata | (Lemmermann) Geitler | image | ||
| Desmogonium rabenhorstianum var. crassum_('crassa') | E.V. Østrup | image | ||
| Diachros incrassata | A.A. Pascher | image | ||
| Dichothrix baueriana var. crassa | Godward | image | ||
| Dudresnaya crassa | M.A. Howe | image | ||
| Dumontia contorta var. incrassata | (Müller) Ruprecht | image | ||
| Dumontia filiformis var. incrassata | (Müller) Kützing | image | ||
| Dumontia filiformis var. incrassata | Lenormand | image | ||
| Dumontia incrassata | (Müller) Lamouroux | image | ||
| Dumontia incrassata var. crispata | Batters | image | ||
| Dysphinctium thwaitesii var. subincrassatum | (Gutwinski) Gutwinski | image | ||
| Ectocarpus confervoides f. crassus_('crassa') | Kjellman | image | ||
| Elachista crassa f. lumbricalis | Takamatsu | image | ||
| Elachista crassa f. rigida | Takamatsu | image | ||
| Elachista crassa | Takamatsu | image | ||
| Entonema incrassatum | Reinsch | image | ||
| Epithemia cistula var. crassa | J. Pantocsek | image | ||
| Epithemia crassa | J. Pantocsek | image | ||
| Epithemia turgida var. crassa | M. Peragallo & J. Heribaud | image | ||
| Erythrotrichia incrassata | Tanaka | image | ||
| Euastrum crassangulatum | F.C.E. Børgesen | image | ||
| Euastrum crassangulatum var. carniolicum | J. Lütkemüller | image | ||
| Euastrum crassangulatum var. conicum | J. Roubal | image | ||
| Euastrum crassangulatum var. ornatum | West | image | ||
| Euastrum crassangulatum var. recte-granulatum_('recte granulatum') | J. Roubal | image | ||
| Euastrum croasdaleae var. incrassatum | K. Förster & F. Eckert | image | ||
| Euastrum incrassatum | C.F.O. Nordstedt | image | ||
| Euastrum incrassatum | C.F.O. Nordstedt | image | ||
| Euastrum pyramidatum var. incrassatum | West & G.S. West | image | ||
| Euastrum sublobatum var. incrassatum | A.M. Scott & G.W. Prescott | image | ||
| Eucheuma muricatum f. incrassatum_('incrassata') | Yamada | image | ||
| Eudesme crassa | (Suringar) Okamura | image | ||
| Euglena tripteris var. crassa | D.O. Svirenko | image | ||
| Euglena tripteris var. crassa | D.O. Svirenko | image | ||
| Eunotia crassa | J. Pantocsek & P. Greguss | image | ||
| Eunotia parallela var. crassa | A. Grunow | image | ||
| Eunotia pectinalis var. crassa | O. Müller | image | ||
| Eunotia veneris var. crassa | M. Hirano | image | ||
| Fischerella muscicola f. crassa | Kossinskaja | image | ||
| Flabellaria incrassata | (Ellis & Solander) Lamarck | image | ||
| Fortiea crassa | (G.S. West) De Toni f. | image | ||
| Frustulia incrassata | Kützing | image | ||
| Fucus hypoglossum var. incrassatus | Turner | image | ||
| Fucus incrassatus 'Turner' | image | |||
| Fucus laceratus var. incrassatus | Turner | image | ||
| Fucus sinuosus var. incrassatus | Turner | image | ||
| Gastridium filiforme var. incrassatum | (Müller) Lyngbye | image | ||
| Gigartina crassa | Plante | image | ||
| Gigartina incrassata | (Kützing) Setchell & Gardner | image | ||
| Gloeocapsa stegophila var. crassa | C.B. Rao | image | ||
| Gomphonema gracile var. crassum_('crassa') | Pandey | image | ||
| Gonatozygon ralfsii f. crassum_('crassa') | W.B. Turner | image | ||
| Goniodoma crassum_('crassa') | Kofoid & Michener | image | ||
| Goniolithon tortuosum f. crassum_('crassa') | (Rosanoff) Foslie | image | ||
| Gracilaria crassa f. conglomerata | Børgesen | image | ||
| Gracilaria crassa | Harvey | image | ||
| Gracilaria crassa | Harvey | image | ||
| Grammita peucedanoides var. incrassata | Bonnemaison | image | ||
| Griffithsia crassa | Kützing | image | ||
| Gymnophlaea incrassata | Kützing | image | ||
| Halimeda incrassata f. cylindrica | Boergesen | image | ||
| Halimeda incrassata f. distorta | Yamada | image | ||
| Halimeda incrassata f. gracilis | Boergesen | image | ||
| Halimeda incrassata f. lamourouxii | (J. Agardh) Barton | image | ||
| Halimeda incrassata f. pusilla | Barton | image | ||
| Halimeda incrassata f. robusta | Boergesen | image | ||
| Halimeda incrassata f. tridentata | Duchass. mscr. | image | ||
| Halimeda incrassata f. tripartita | Barton | image | ||
| Halimeda incrassata | Lamouroux f. distorta Yamada | image | ||
| Halimeda incrassata var. monile_('monilis') | (Ell. & Sol.) Harvey | image | ||
| Halimeda incrassata var. ovata | J. Agardh | image | ||
| Halimeda incrassata var. simulans | (Howe) Boergesen | image | ||
| Halymenia filiformis var. incrassata | (Mueller) C. Agardh | image | ||
| Hantzschia amphioxys f. crassa | Otto Müller | image | ||
| Hantzschia amphioxys var. crassa | M. Peragallo | image | ||
| Hantzschia crassa | Pantocsek | image | ||
| Hantzschia crassa var. jeniseyensis | Skvortzov | image | ||
| Helierella crassa | (Brébisson) Kuntze | image | ||
| Helierella incrassata | (Nordstedt) Kuntze | image | ||
| Helminthoida subcrassa | Ulrich | image | ||
| Heterocarpella crassa | Brébisson | image | ||
| Heteromita crassa | De Fromentel | image | ||
| Heterosiphonia coccinea f. crassa | (J. Agardh) De Toni | image | ||
| Hormiscia crassa | (Kützing) De Toni | image | ||
| Hormiscia crassa | (Rosenvinge) Collins | image | ||
| Hormiscia crassa var. naegeliana | (Kützing) De Toni | image | ||
| Hormiscia incrassata | (Kjellman) Collins | image | ||
| Hydrurus penicillatus f. crassafusconigrescens_('crassa fusco-nigrescens') [Rabenhorst] | image | |||
| Involucrana crassa | (Hooker & Harvey) Gordon | image | ||
| Kephyriopsis crassa | Hilliard | image | ||
| Leptobasis crassa | (W. West) Geitler | image | ||
| Leptothrix crassa | Kholodnyi | image | ||
| Liagora crassa | G. Dickie | image | ||
| Liagora crassa | Levring | image | ||
| Lithophyllum cristatum f. crassum_('crassa') | (Rosanoff) Hauck | image | ||
| Lithophyllum fasciculatum f. incrassatum_('incrassata') | (Foslie) Foslie | image | ||
| Lithophyllum tortuosum f. crassum_('crassa') | (Rosanoff) Foslie | image | ||
| Lithothamnion corallioides f. crassum_('crassa') | Heydrich | image | ||
| Lithothamnion fasciculatum f. incrassatum_('incrassata') | Foslie | image | ||
| Lithothamnion heterocladum f. crassum_('crassa') | Foslie | image | ||
| Lithothamnion incrassatum | Foslie | image | ||
| Lithothamnion rubrum f. crassum_('crassa') | (Heydrich) Heydrich | image | ||
| Lyngbya crassa | Crouan fr. | image | ||
| Lyngbya crassa | J. Agardh | image | ||
| Lyngbya cryptovaginata var. crassa | V. Das & Mitra | image | ||
| Lyngbya major var. crassa | (Crouan fr.) Crouan fr. | image | ||
| Lyngbya nigra var. crassa | Vasishta | image | ||
| Lyngbya spirulinoides f. crassa | Tewari | image | ||
| Lyngbya thermalis f. crassa | Halasz | image | ||
| Maslovichara crassa | Saidakovsky | image | ||
| Mastocarpus incrassatus | Kützing | image | ||
| Mesogloia crassa f. breviramea | Suringar | image | ||
| Mesogloia filum var. crassa | Sonder | image | ||
| Micrasterias laticeps var. crassa | G.W. Prescott | image | ||
| Microspora amoena var. crassa | Schmidle | image | ||
| Monas crassa | (F. Dujardin) K.M. Diesing | image | ||
| Mougeotia crassa | (Wolle) De Toni | image | ||
| Mougeotia gotlandica var. crassa | Randhawa | image | ||
| Mougeotia subcrassa | G.S. West | image | ||
| Myriodactylon incrassatum | (Hudson) Desvaux | image | ||
| Navicula crassa | Gregory | image | ||
| Navicula cuspidata f. crassa | Venkataraman | image | ||
| Navicula erosa var. crassa Østrup | image | |||
| Navicula superba var. crassa | (Østrup) Gran | image | ||
| Netrium naegelii f. crassum_('crassa') | Viret | image | ||
| Nitella flexilis f. crassa | Wahlstedt | image | ||
| Nitella flexilis var. crassa | Braun | image | ||
| Nitzschia medioincrassata | Vyverman | image | ||
| Nitzschia tryblionella var. crassa | (Pantocsek) Cleve-Euler | image | ||
| Nodularia crassa | (Voronikhin) J. Komarek, M. Hübel, H. Hübel, & J. Smarda | image | ||
| Nodularia spumigena var. crassa | Voronikhin | image | ||
| Nostoc ellipsosporum var. crassum_('crassa') | Laloraya | image | ||
| Nostoc muscorum f. crassum_('crassa') | Schwabe | image | ||
| Oedogonium borisianum var. crassum_('crassa') | R.N. Singh | image | ||
| Oedogonium franklinianum f. crassum_('crassa') | R.N. Singh | image | ||
| Oedogonium incrassatum | Hallas | image | ||
| Oocystis crassa f. major | Printz | image | ||
| Oocystis crassa f. pakis | Ruttner | image | ||
| Oocystis crassa var. asymmetrica | (West & West) Chodat | image | ||
| Oocystis crassa var. elongata | Playfair | image | ||
| Oocystis crassa var. granulosa | Playfair | image | ||
| Oocystis crassa var. marssonii | (Lemmermann) Printz | image | ||
| Oocystis crassa var. minor | Nygaard | image | ||
| Oocystis crassa var. nodulosa | (West & West) Chodat | image | ||
| Oocystis crassa var. ostenfeldii | Playfair | image | ||
| Oocystis crassa | Wittrock | image | ||
| Oocystis gigas var. crassa | Gaidukov | image | ||
| Oocystis gigas var. crassa | Gaidukov | image | ||
| Oocystis gigas var. incrassata | West & West | image | ||
| Oocystis incrassata | (W. West & G. West) Skuja | image | ||
| Oocystis incrassata var. oculus | Cedergren | image | ||
| Oocystis naegelii var. incrassata | Lemmermann | image | ||
| Oocystis nodulosa var. crassa | Playfair | image | ||
| Oocystis solitaria var. crassa | (Wittrock) Hansgirg | image | ||
| Opuntiodes incrassata_('incrassatum') | (Ellis) O. Kuntze | image | ||
| Oscillatoria angusta var. crassa | Woronikhin | image | ||
| Oscillatoria fonticola var. subcrassa | Brabez | image | ||
| Oscillatoria proboscidea f. crassa | Tiwari | image | ||
| Oscillatoria subbrevis f. crassa | Dixit | image | ||
| Oscillatoria tenuis var. subcrassa | Conrad | image | ||
| Palmaria crassa | (Zanardini) O. Kuntze | image | ||
| Palmella crassa | Naccari | image | ||
| Palmogloea crassa | Kützing | image | ||
| Paraspora fruticulosa f. crassa | Heydrich | image | ||
| Penium incrassatum f. majus_('major') | Maskell | image | ||
| Penium incrassatum f. minus_('minor') | Maskell | image | ||
| Penium incrassatum | Maskell | image | ||
| Peranemopsis crassa | Skvortzov & Noda | image | ||
| Peridinium oblongum f. crassa | A. Böhm | image | ||
| Peridinium oceanicum var. crassa | A. Böhm | image | ||
| Phacus alatus var. incrassata | Deflandre | image | ||
| Phacus incrassatus | (Deflandre) Pochmann | image | ||
| Phacus polytrophos var. crassa | Bourrelly | image | ||
| Pinnularia crassa | B.V. Skvortzov | image | ||
| Pinnularia crassa | F. Meister | image | ||
| Pinnularia major var. crassa | L.A. Brebisson | image | ||
| Pinnularia parallela var. crassa | E.V. Østrup | image | ||
| Pinnularia rectangulata var. crassa | E.V. Østrup | image | ||
| Planktolyngbya crassa | J. Komarkova-Legnerova & G. Cronberg | image | ||
| Platoma incrassatum_('incrassata') | Schousboe | image | ||
| Platoma incrassatum_('incrassata') | Schousboe | image | ||
| Plectonema calothrichoides f. crassum_('crassa') | Laloraya & Mitra | image | ||
| Pleurotaenium ehrenbergii var. crassum_('crassa') | Venkataraman | image | ||
| Polysiphonia crassa | Okamura | image | ||
| Polysiphonia intricata var. crassa | Ardissone | image | ||
| Proaulopora crassa | Korde | image | ||
| Prolifera crassa | (Hassall) Kuntze | image | ||
| Pseudanabaena mucicola f. crassa | (Skuja) Hindak | image | ||
| Rhizosolenia crassa | A.F.W. Schimper | image | ||
| Rhizosolenia crassa | V. Hensen | image | ||
| Rhodymenia bifida var. incrassata | Harvey | image | ||
| Rhodymenia crassa | Zanardini | image | ||
| Rhodymenia marginicrassa | In Kyu Lee | image | ||
| Rhopalodia gibberula f. crassa | Otto Müller | image | ||
| Rivularia atra f. inaequicrassa | Ercegovic | image | ||
| Romeria crassa | F. Hindak | image | ||
| Scenedesmus ecornis f. crassapicatus | Huber-Pestalozzi | image | ||
| Scenedesmus incrassatulus f. robustus | Uherkovich | image | ||
| Scenedesmus incrassatulus var. alternans | Dedusenko | image | ||
| Scenedesmus incrassatulus var. mononae | G.M. Smith | image | ||
| Scenedesmus incrassatulus var. ovalis | Svirenko | image | ||
| Scenedesmus incrassatulus var. reniformis | Khristyuk | image | ||
| Scenedesmus incrassatulus var. robustus | (Uherkovich) Pankow | image | ||
| Scenedesmus incrassatulus var. spinosus | Mosto | image | ||
| Scenedesmus incrassatus 'Bohlin' | image | |||
| Schizosiphon scopulorum var. crassa | F.T. Kützing | image | ||
| Scinaia incrassata | Eiseman | image | ||
| Scorpiura incrassata | ("Turn.") Stackhouse | image | ||
| Scytonema hofmanii var. crassa | Bharadwaja | image | ||
| Scytonema incrassatum | Jao | image | ||
| Serpentinaria crassa | (Wolle) Kuntze | image | ||
| Sphacelaria crassa | C. Agardh | image | ||
| Sphacelaria crassa | C. Agardh | image | ||
| Sphacelaria tribuloides f. crassa | Reinke | image | ||
| Sphacelaria tribuloides var. crassa | (Reinke) Sauvageau | image | ||
| Sphaerococcus laceratus var. incrassatus | S.F. Gray | image | ||
| Sphaeroplea africana var. crassa | Fritsch | image | ||
| Spirogyra arcta f. incrassata | Filarszky | image | ||
| Spirogyra crassa | (Kützing) Kützing | image | ||
| Spirogyra crassa [subsp.] genuina | (Kirchner) Hansgirg | image | ||
| Spirogyra crassa [subsp.] maxima | (Hassall) Hansgirg | image | ||
| Spirogyra crassa f. crassoidea | (Transeau) Poljansky | image | ||
| Spirogyra crassa f. heeriana | (Nägeli) Petit | image | ||
| Spirogyra crassa var. formosa | Transeau | image | ||
| Spirogyra crassa var. genuina | Kirchner | image | ||
| Spirogyra crassa var. heeriana | (Nägeli ex Kützing) Kirchner | image | ||
| Spirogyra crassa var. inaequalis | (Wolle) Hansgirg | image | ||
| Spirogyra crassa var. jassiensis | Teodoresco | image | ||
| Spirogyra crassa var. megaspora | (Lagerheim) Hansgirg | image | ||
| Spirogyra fuellebornii f. crassa | Bhashyakarla Rao | image | ||
| Spirogyra fuellebornii var. crassa | M. Gupta & D.C. Pandey | image | ||
| Spirogyra incrassata | Czurda | image | ||
| Spirogyra spreeiana var. crassa | Bhashyakarla Rao | image | ||
| Spirogyra subcrassa | Woronichin | image | ||
| Spirogyra verruculosa var. crassa | R.N. Singh | image | ||
| Spirotaenia obscura var. crassa_('crassum') | J.A. Cushman | image | ||
| Spirulina meneghiniana var. crassa | D. Mukherjee | image | ||
| Spongiochloris incrassata | Chantanachat & Bold | image | ||
| Spongites crassus_('crassa') | (Philippi) Kützing | image | ||
| Spyridia crassa | Kützing | image | ||
| Staurastrum novae-semliae var. crassangulatum | R.L. Grönblad | image | ||
| Staurastrum punctulatum f. crassa | F. Gay | image | ||
| Staurodesmus curvatus var. incrassatus | (Scott & Prescott) Teiling | image | ||
| Staurodesmus sibiricus var. crassangulatus | (Børgesen) Teiling | image | ||
| Stauroneis anceps f. crassa | E.V. Oestrup | image | ||
| Stauroneis anceps var. crassa | E.V. Østrup | image | ||
| Stauroneis phoenicenteron f. crassa | M. Peragallo & J. Heribaud | image | ||
| Stichospora crassa | (Philippi) Heydrich | image | ||
| Stradneria limbicrassa | Reinhardt | image | ||
| Striaria attenuata var. crassa | Ardissone | image | ||
| Synechocystis crassa | Woronichin | image | ||
| Synedra ulna var. crassa | E.V. Østrup | image | ||
| Synedra ulna var. crassa | G.S. Venkataraman, illeg. | image | ||
| Tenarea tortuosa f. crassa | (S.M. Rozanov) Me. Lemoine | image | ||
| Tenarea undulosa var. crassa | (S.M. Rozanov) P.A. Hariot | image | ||
| Tetmemorus granulatus f. crassus_('crassa') | Auclair | image | ||
| Tetracyclus emarginatus var. crassus_('crassa') | Héribaud & M. Peragallo | image | ||
| Tetraedron trigonum f. crassum_('crassa') | Ruttner | image | ||
| Tetraporina crassa | Naumova | image | ||
| Tetraporina incrassata | Naumova | image | ||
| Tetraspora crassa | Liebmann | image | ||
| Tetraspora crassa | Liebmann ex Kützing | image | ||
| Tolypothrix crassa | W. West & G.S. West | image | ||
| Trachelomonas crassata | B.V. Skvortzov | image | ||
| Trachelomonas crassata var. collaris | B.V. Skvortzov | image | ||
| Trachelomonas crassata var. granulata | B.V. Skvortzov | image | ||
| Trachelomonas crassata var. hispida | B.V. Skvortzov | image | ||
| Trachelomonas crassata var. hyalina | B.V. Skvortzov | image | ||
| Trachelomonas crassata var. ussuriensis | B.V. Skvortzov | image | ||
| Trachelomonas curta f. crassatiifera | T.A. Safonova | image | ||
| Trachelomonas hispida var. incrassata | D.O. Svirenko | image | ||
| Triceratium incrassatum | Castracane | image | ||
| Trochiscia crassa | Hansgirg | image | ||
| Tryblionella debilis var. crassa | Pantocsek | image | ||
| Ulothrix crassa | (Kützing) Kützing | image | ||
| Ulothrix crassa | Kützing | image | ||
| Ulothrix crassa var. naegeliana | Kützing | image | ||
| Ulothrix parietina var. crassa | (Kützing) Hansgirg | image | ||
| Ulothrix zonata var. crassa | (Kützing) Stockmayer | image | ||
| Ulva crassa | Kjellman | image | ||
| Ulva crassa | Kjellman | image | ||
| Ulva crassa | V.J. Chapman | image | ||
| Ulva incrassata | Müller | image | ||
| Ulva incrassata | W. Hudson | image | ||
| Urospora crassa | J.L.A.K. Rosenvinge | image | ||
| Urospora incrassata | F.R. Kjellman | image | ||
| Vesiculifera crassa | Hassall | image | ||
| Wrangelia crassa | Hooker f. & Harvey | image | ||
| Xanthidium antilopaeum f. incrassatum_('incrassata') | R.L. Grönblad | image | ||
| Xanthidium antilopaeum var. incrassatum | (R.L. Grönblad) K. Förster | image | ||
| Zygnema atrocoeruleum var. crassa | Misra | image | ||
| Zygnema cylindrosporum var. crassum_('crassa') | Bhashyakarla Rao | image | ||
| Zygnema sphaericum f. crassum_('crassa') | Misra | image | ||
| Zygnema vaginatum f. crassum_('crassa') | Paruk. | image | ||
| Zygnemopsis minuta var. crassa | Randhawa | image | ||
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