Index Nominum Algarum Image Index
471 CARD IMAGES
beginning with PLAGIOGRAMMA
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- PLAGIOGRAMMA Greville
- Plagiogramma adriaticum Grunow
- Plagiogramma africanum Leuduger-Fortmorel CAS
- Plagiogramma angulatum Greville CAS
- Plagiogramma antillarum Cleve CAS
- Plagiogramma appendiculatum Giffen CAS
- Plagiogramma approximatum Schmidt
- Plagiogramma ascensionis Leuduger-Fortmorel
- Plagiogramma atomus Greville CAS
- Plagiogramma attenuatum Cleve CAS
- Plagiogramma barbadense Greville CAS
- Plagiogramma barbadense var. actinella Brun
- Plagiogramma biharense Pantocsek CAS
- Plagiogramma bilobatum J. Brun CAS
- Plagiogramma bilobatum Leuduger-Fortmorel CAS
- Plagiogramma boryanum Pantocsek CAS
- Plagiogramma brockmannii ('brockmanni') Hustedt
- Plagiogramma brockmannii var. elongatum Salah CAS
- Plagiogramma californicum Greville CAS
- Plagiogramma caribaeum Cleve CAS
- Plagiogramma caribaeum var. labuense Cleve CAS
- Plagiogramma caribaeum f. pusillum ('pusilla') Schmidt
- Plagiogramma ceylanense Leuduger-Fortmorel CAS
- Plagiogramma constrictum Greville CAS
- Plagiogramma constrictum var. nankoorense ('nankoorensis') Grunow
- Plagiogramma costatum Greville CAS
- Plagiogramma costatum O'Meara CAS
- Plagiogramma crassum Cleve & Grove CAS
- Plagiogramma decussatum Greville CAS
- Plagiogramma distinctum A. Mann CAS
- Plagiogramma elongatum Greville CAS
- Plagiogramma elongatum var. robustum ('robusta') Tempère & Brun
- Plagiogramma exiguum Hendey CAS
- Plagiogramma fascinatum Hanna & Grant CAS
- Plagiogramma fenestra Brun
- Plagiogramma fenestra Brun
- Plagiogramma fossile Hajós CAS
- Plagiogramma gregorianum Greville CAS
- Plagiogramma gregorianum var. robustum ('robusta') Brun
- Plagiogramma grevilleanum Grunow CAS
- Plagiogramma grevillii Ralfs
- Plagiogramma hidalgoi Azpeitia Moros CAS
- Plagiogramma himantidium (Ehrenberg) Ralfs
- Plagiogramma hymenoptera Hanna & Grant CAS
- Plagiogramma inaequale Greville CAS
- Plagiogramma informe Schmidt
- Plagiogramma insolito Hanna & Grant CAS
- Plagiogramma interruptum (Gregory) Ralfs
- Plagiogramma interruptum var. adriaticum Grunow
- Plagiogramma itaparicanum Zimmermann CAS
- Plagiogramma jamaicense Greville CAS
- Plagiogramma kinkeri Schmidt
- Plagiogramma labuense Cleve CAS
- Plagiogramma laeve ('laevis') (Gregory) Ralfs
- Plagiogramma loczyi Pantocsek CAS
- Plagiogramma lyratum Greville CAS
- Plagiogramma maeoticum Proschkina-Lavrenko CAS
- Plagiogramma margaritaceum Castracane CAS
- Plagiogramma marginatum ('marginatus') Hanna CAS
- Plagiogramma marginatum ('marginata') (Grove & Sturt) Schrader CAS
- Plagiogramma minimum Salah CAS
- Plagiogramma mutuum Schmidt
- Plagiogramma nankoorense ('nancoorense') Grunow
- Plagiogramma nankoorense (Grunow) Grunow
- Plagiogramma nankoorense var. biconstrictum ('biconstricta') Cleve & Grove ex Schmidt {in syn.}
- Plagiogramma nankoorense var. minutum ('minuta') Cleve CAS
- Plagiogramma nankoorense var. triconstricta ('triconstrictum') Cleve & Grove CAS
- Plagiogramma neogradense Pantocsek CAS
- Plagiogramma neogradense var. curtum Azpeitia Moros CAS
- Plagiogramma obesum Greville
- Plagiogramma occasum Giffen CAS
- Plagiogramma orientale Greville CAS
- Plagiogramma ornatum Greville CAS
- Plagiogramma ornatum var. undulatum Grunow
- Plagiogramma paleogena Glezer
- Plagiogramma panduriforme Leuduger-Fortmorel CAS
- Plagiogramma pantocsekii ('pantocseki') Hajós CAS
- Plagiogramma papilio Cleve & Grove CAS
- Plagiogramma parallelum Salah CAS
- Plagiogramma polygibbum Cleve & Grove CAS
- Plagiogramma pulchellum Greville CAS
- Plagiogramma pulchellum var. acutum ('acuta') Hajós CAS
- Plagiogramma pulchellum var. intermedium ('intermedia') Misra CAS
- Plagiogramma pygmaeum Greville CAS
- Plagiogramma quadrigibbum Grunow CAS
- Plagiogramma quadrigibbum Brun
- Plagiogramma rectum Cleve & Grove CAS
- Plagiogramma rhombicum Hustedt CAS
- Plagiogramma robertsianum Greville CAS
- Plagiogramma robustum Schmidt
- Plagiogramma robustum (J. Brun) Frenguelli
- Plagiogramma rokupriense Woodhead & Tweed CAS
- Plagiogramma rutilarioides Cleve CAS
- Plagiogramma salinarium Pantocsek CAS
- Plagiogramma sceptrum A. Mann CAS
- Plagiogramma schmidtii E.J.F. Wood CAS
- Plagiogramma sexagibbum Leuduger-Fortmorel CAS
- Plagiogramma seychellarum Grunow ex Cleve CAS
- Plagiogramma sigmoideum Salah CAS
- Plagiogramma spectabile Greville CAS
- Plagiogramma spectabile var. polygibbum Cleve & Grove CAS
- Plagiogramma spectabile var. quadrigibbum Grunow CAS
- Plagiogramma spinosum Cleve CAS
- Plagiogramma staurophorum (Gregory) Heiberg CAS
- Plagiogramma staurophorum var. fossile ('fossilis') Hajós
- Plagiogramma stipitatum Grunow
- Plagiogramma sulcatum Cleve & Grove CAS
- Plagiogramma sumatrense Leuduger-Fortmorel CAS
- Plagiogramma tenuissimum Hustedt
- Plagiogramma tenuistriatum Cleve CAS
- Plagiogramma tessellatum Greville CAS
- Plagiogramma thaitiense Castracane
- Plagiogramma truanii Pantocsek CAS
- Plagiogramma truanii f. regulare ('regularis') Jurilj CAS
- Plagiogramma validum Greville CAS
- Plagiogramma validum var. fenestra Brun {info}
- Plagiogramma validum var. tumidulum Grunow
- Plagiogramma vanheurckii ('van heurckii') Grunow
- Plagiogramma wallichianum Greville CAS
- Plagiogramma zanzibaricum Amossé CAS
- PLAGIOGRAMMOPSIS Hasle, von Stosch & Syvertsen
- Plagiogrammopsis mediaequata ('mediaequatus') Gardner & Crawford
- Plagiogrammopsis vanheurckii (Grunow) Hasle, von Stosch & Syvertsen CAS
- PLAGIOLEMMA Paddock
- Plagiolemma confusum ('confusa') (Hendey) Paddock
- Plagiolemma inflatum ('inflata') Paddock CAS
- PLAGIOMASTIX Diesing {subgenus of Chilomonas}
- PLAGIOMASTIX Diesing
- Plagiomastix granulosa (Dujardin) Diesing
- Plagiomastix jaculans (Perty) Diesing
- Plagiomastix obliqua (Dujardin) Diesing
- Plagiomastix urceolaris (Party) Diesing
- PLAGIOMONAS Butcher {subgen. of Hemiselmis}
- PLAGIOMONAS Grassi
- Plagiomonas gryllotalpae (Grassi) Grassi
- PLAGIONEMA Chevallier
- Plagionema crustaceum Chevallier
- PLAGIORHIZA Pascher
- Plagiorhiza notostoma Pascher
- Plagiorhiza rhizopodica (Conrad) Pascher
- PLAGIOSELMIS R.W. Butcher
- PLAGIOSELMIS R.W. Butcher ex M.J. Chretiennot-Dinet
- PLAGIOSELMIS R.W. Butcher ex G. Novarino, I.A.N. Lucas, & S. Morrall
- Plagioselmis nannoplanctica (H. Skuja) G. Novarino, I.A.N. Lucas, & S. Morrall
- Plagioselmis prolonga R.W. Butcher
- Plagioselmis prolonga Butcher ex G. Novarino, I.A.N. Lucas, & S. Morrall
- Plagioselmis prolonga var. nordica G. Novarino, I.A.N. Lucas, & S. Morrall
- Plagioselmis punctata R.W. Butcher
- PLAGIOSPERMUM Oliver {info: 1886 renamed Sinoplagiospermum}
- PLAGIOSPERMUM Cleve
- PLAGIOSPERMUM (Cleve) Wittrock {subgenus}
- PLAGIOSPERMUM (Cleve) De Toni {sect. of Mougeotia}
- PLAGIOSPERMUM Gauthier-Lievre {Section}
- Plagiospermum tenue Cleve
- Plagiospermum tenue var. crassius Wolle
- Plagiospermum tenue var. minus ('minor') Wolle
- PLAGIOSPORA Kuckuck
- Plagiospora gracilis Kuckuck
- PLAGIOSTOMUM Massart
- Plagiostomum spirale Massart
- PLAGIOSTOMUM Zanon
- Plagiostomum reniforme Zanon
- PLAGIOTROPIS Pfitzer
- PLAGIOTROPIS (Pfitzer) Cleve {section of Tropidoneis}
- Plagiotropis adriatica (Cleve) Kuntze CAS
- Plagiotropis antarctica (Cleve) Kuntze
- Plagiotropis approximata (Cleve) Kuntze CAS
- Plagiotropis arizonica Czarnecki & Blinn CAS
- Plagiotropis australis (M. Peragallo) Paddock CAS
- Plagiotropis baltica Pfitzer CAS
- Plagiotropis baltica var. mediterranea Grunow {info}
- Plagiotropis baltica var. scaligera Grunow {info}
- Plagiotropis chinensis (Cleve) Kuntze CAS
- Plagiotropis cochinvitreopsis Paddock CAS
- Plagiotropis conserta (F.W. Lewis) Kuntze CAS
- Plagiotropis delicatula (Greville) Paddock CAS
- Plagiotropis eximia (Greville) Paddock CAS
- Plagiotropis fasciata Paddock CAS
- Plagiotropis gaussii (Heiden) Paddock CAS
- Plagiotropis gibberula Grunow
- Plagiotropis grevillei Paddock CAS
- Plagiotropis japonica (Cleve) Kuntze CAS
- Plagiotropis kinkeriana (Cleve) Kuntze CAS
- Plagiotropis lata (Cleve) Kuntze CAS
- Plagiotropis lepidoptera (Gregory) Kuntze CAS
- Plagiotropis lepidoptera var. delicatula (Greville) Nizamuddin CAS
- Plagiotropis lepidoptera var. proboscidea (Cleve) Reimer
- Plagiotropis lepidoptera var. scattestriata Qi, Lin & Zhang
- Plagiotropis longa (Cleve) Kuntze CAS
- Plagiotropis maxima (Gregory) Kuntze CAS
- Plagiotropis mediterranea Grunow CAS
- Plagiotropis membranacea (Cleve) Kuntze CAS
- Plagiotropis neapolitana ('neopolitana') Paddock
- Plagiotropis neosamoensis ('neusamoensis') Paddock
- Plagiotropis neovitrea Paddock CAS
- Plagiotropis oblonga (Greville) Paddock CAS
- Plagiotropis oviformis Paddock CAS
- Plagiotropis posewitzii (Pantocsek) De Toni CAS
- Plagiotropis primoris (Hanna) Paddock CAS
- Plagiotropis proboscidea Cleve CAS
- Plagiotropis pusilla (Gregory) Kuntze CAS
- Plagiotropis samoensis Grunow
- Plagiotropis scaligera Grunow
- Plagiotropis semihyalina Paddock CAS
- Plagiotropis semistriata (Grunow) Kuntze CAS
- Plagiotropis seriata (Cleve) Kuntze CAS
- Plagiotropis solidula (Cleve) Kuntze CAS
- Plagiotropis subalata (Cleve) Paddock CAS
- Plagiotropis sumbavensis (Cleve) Kuntze CAS
- Plagiotropis tayrecta Paddock CAS
- Plagiotropis vanheurckii ('van heurckii') Grunow
- Plagiotropis vitrea Grunow
- Plagiotropis vitrea var. lindigii Grunow
- Plagiotropis zebra (Cleve) Kuntze CAS
- PLANCTOCOCCUS Korshikov
- Planctococcus alsius Skuja
- Planctococcus sphaerocystiformis Korshikov
- PLANCTONEMA Schmidle
- Planctonema lauterbornii ('lauterborni') Schmidle
- Planctonema subtilissimum (Lagerheim) Hällfors
- PLANICIRCUS Frenguelli
- PLANINOSPHAERIDIUM Eisenack
- Planinosphaeridium membranaceum Eisenack
- PLANIOSCULUM A. Szabados
- Planiosculum hungaricum A. Szabados
- Planiosculum hungaricum f. angustiosculum A. Szabados
- Planiosculum hungaricum f. nepenthiforme ('nepenthiformis') A. Szabados
- Planktolyngbya crassa J. Komarkova-Legnerova & G. Cronberg
- Planktolyngbya brevicellularis G. Cronberg & J. Komarek
- Planktolyngbya limnetica (Lemmermann) J. Komarkova-Legnerova & G. Cronberg
- Planktolyngbya regularis J. Komarkova-Legnerova & R. Tavera
- Planktolyngbya spirulinoides I. Umezaki & M. Watanabe
- Planktolyngbya tallingii J. Komarek & H. Kling
- Planktolyngbya undulata J. Komarek & H. Kling
- Planicircus japonicus Frenguelli
- PLANKTONEMA {info}
- PLANKTONIELLA Schütt
- Planktoniella blanda (A. Schmidt) Syvertsen & Hasle
- Planktoniella californica Long, Fuge & Smith {info: 'Planktonella'}
- Planktoniella florea Wood, Crosby & Cassie CAS
- Planktoniella formosa (Schimper) Karsten CAS
- Planktoniella muriformis (Loeblich III, Wight & Darley) Round
- Planktoniella sol (Wallich) Schütt CAS
- Planktoniella woltereckii Schimper
- PLANKTOSPHAERELLA Reisigl
- Planktosphaerella terrestris Reisigl
- PLANKTOSPHAERIA G. M. Smith
- Planktosphaeria botryoides W. Herndon
- Planktosphaeria gelatinosa G. M. Smith
- Planktosphaeria maxima H.W. Bischoff & H.C. Bold
- Planktosphaeria texensis H.W. Bischoff & H.C. Bold
- Planktothrix iwanoffiana (Nygaard) I. Umezaki & M. Watanabe
- Planktothrix lacustris (Klebahn) I. Umezaki & M. Watanabe
- Planktothrix miyadii (Negoro) I. Umezaki & M. Watanabe
- PLANOCHLORIS Komarek
- Planochloris pyrenoidifera (Korsikov) Komarek
- PLANODINIUM Saunders & Dodge
- Planodinium striatum R.D. Saunders & J.D. Dodge
- PLANONEPHROS Christensen
- PLANONEPHROS Christensen
- Planonephros dispar Christensen
- Planonephros dispar Christensen
- PLANOPHILA Gerneck
- Planophila asymmetrica ('assymmetrica') (Gerneck) Wille
- Planophila bipyrenoidosa Reisigl
- Planophila communis Watanabe
- Planophila laetevirens Gerneck
- Planophila microcystis (Dangeard) P. Kornmann & P.-H. Sahling
- Planophila sphagnothermalis Pascher
- Planophila terrestris Groover & Hofstetter
- PLANOSPHAERULA Borzì
- Planosphaerula natans Borzì
- PLANOTAENIUM S. Ohtani {Section}
- PLANOTHIDIUM F.E. Round & L. Bukhtiyarova
- Planothidium calcar (Cleve) Round & Bukhtiyarova CAS
- Planothidium delicatulum (Kützing) Round & Bukhtiyarova CAS
- Planothidium dubium (Grunow) Round & Bukhtiyarova CAS
- Planothidium ellipticum (Cleve) Round & Bukhtiyarova CAS
- Planothidium engelbrechtii (Cholnoky) Round & Bukhtiyarova CAS
- Planothidium fragilarioides (J.B. Petersen) Round & Bukhtiyarova CAS
- Planothidium frequentissimum (Lange-Bertalot) Round & Bukhtiyarova CAS
- Planothidium haukianum (Grunow) Round & Bukhtiyarova CAS
- Planothidium lanceolatum (Brébisson) Round & Bukhtiyarova CAS
- Planothidium oestrupii (Cleve-Euler) Round & Bukhtiyarova CAS
- Planothidium peragalloi ('peragallii') (Brun & Héribaud) Round & Bukhtiyarova CAS
- Planothidium rostratum (Østrup) Round & Bukhtiyarova CAS
- Planothidium septentrionale ('septentrionalis') (Østrup) Round & Bukhtiyarova CAS
- PLASMODROMA Doflein {Unterstamm}
- PLATELLA Proshkina-Lavrenko
- Platella mirabilis Proshkina-Lavrenko
- PLATOMA Schousboe
- PLATOMA Schousboe ex Schmitz
- PLATOMA Schousboe ex Schmitz
- PLATOMA J. Agardh {section}
- Platoma abbottianum_('abbottiana') J. Norris & Bucher
- Platoma appendiculatum_('appendiculata') Schousboe
- Platoma ardreanum G.T. Kraft & I.A. Abbott
- Platoma australicum_('australica') Womersley & G.T. Kraft
- Platoma bairdii (Farlow) Kuckuck
- Platoma cervicorne_('cervicornis') (J. Agardh) Bornet
- Platoma cervicornis (J. Agardh) {info}
- Platoma cyclocolpum_('cyclocolpa') (Montagne) Schmitz
- Platoma cyclocolpum_('cyclocolpa') (Montagne) Schmitz
- Platoma dichotomum_('dichotoma') Schousboe
- Platoma fanii Dawson
- Platoma filicinum_('filicina') Schousboe
- Platoma floresii Schousboe
- Platoma foliosum_('foliosa') Womersley & G.T. Kraft
- Platoma hepaticum_('hepatica') Schousboe
- Platoma hymenophyllum_('hymenophylla') Schousboe
- Platoma hymenophyllum_('hymenophylla') Schousboe
- Platoma incrassatum_('incrassata') Schousboe
- Platoma incrassatum_('incrassata') Schousboe
- Platoma izunosimense_('izunosimensis') Segawa
- Platoma japonicum_('japonica') Okamura
- Platoma marginiferum_('marginifera') (J. Agardh) Schmitz ex Bornet
- Platoma marginiferum_('marginifera') (J. Agardh) Batters
- Platoma megalospermum_('megalosperma') Schousboe
- Platoma multifidum Schousboe {mscr.}
- Platoma multifida Schousboe {in syn.}
- Platoma papyracea Schousboe {in syn.}
- Platoma pikeanum ('pikeana') (Dickie) Weber-van Bosse
- Platoma tenue_('tenuis') M.A. Howe & W.R. Taylor
- Platoma tingitanum_('tingitana') Schousboe
- PLATYCHARA Grambast
- Platychara caudata L. Grambast
- Platychara compressa Grambast
- PLATYCHLORIS Pascher
- Platychloris minima Pascher
- PLATYCHONDRIA Falkenberg {Subgenus}
- PLATYCHRYSELLA Valkanov
- Platychrysella vorax Valkanov
- PLATYCHRYSIS Geitler
- Platychrysis neustophila Norris
- Platychrysis pienarii Gayral & Fresnel {nomen}
- Platychrysis pienaarii Gayral & Fresnel
- Platychrysis pigra Geitler
- Platychrysis simplex Gayral & Fresnel {nomen}
- Platychrysis simplex Gayral & Fresnel
- PLATYCLINIA J. Agardh
- Platyclinia agardhii Papenfuss
- Platyclinia crispata (Hooker f. & Harvey) De Toni
- Platyclinia crozieri_('crozierii') (Hooker f. & Harvey) J. Agardh
- Platyclinia fuegiensis Skottsberg
- Platyclinia fuscorubra (Hooker f. & Harvey) Levring
- Platyclinia kylinii Papenfuss
- Platyclinia purpurea J.Agardh
- Platyclinia stipitata J. Agardh
- Platyclinia taylorii Levring
- PLATYCYSTIDIA Cookson & Eisenack
- Platycystidia diptera Cookson & Eisenack
- PLATYDICTYON J. Agardh {subgenus}
- PLATYDINIUM Kofoid {subgenus}
- PLATYDOME J. Agardh {tribus of Mychodea}
- PLATYDORINA Kofoid
- Platydorina caudata Kofoid
- PLATYGLENA Hansgirg {sect. of Euglena}
- PLATYGLENA (Hansgirg) Francé {subgen. of Euglena}
- PLATYLITHOPHYCUS J. Johnson & B. Howell
- Platylithophycus cretaceus_('cretaceum') Johnson & Howell
- PLATYLOBIUM Kützing
- Platylobium ensifolium (C. Agardh) Kützing
- Platylobium mertensii Kützing
- PLATYMENIA J. Agardh
- Platymenia apoda J. Agardh
- Platymenia binderi (J. Agardh ex Kützing) Kuntze
- Platymenia bullosa (Harvey) Kuntze
- Platymenia carnosa J. Agardh
- Platymenia cordata J. Agardh
- Platymenia edulis (Stackhouse) J. Agardh
- Platymenia erosa J. Agardh
- Platymenia ligulata (Suringar) Kuntze
- Platymenia marginata (Roussel) Kuntze
- Platymenia mertensiana (Postels & Ruprecht) Kuntze
- Platymenia minor (J. Agardh) Kuntze
- Platymenia obovata (J. Agardh) Kuntze
- Platymenia stipitata (J. Agardh) Kuntze
- Platymenia undulata J. Agardh
- Platymenia undulata var. linearis J. Agardh
- Platymenia undulata var. obovata J. Agardh
- PLATYMONAS West
- Platymonas apiculata Butcher
- Platymonas arnoldii (Proshkina-Lavrenko) Matvienko
- Platymonas bichlora H. Ettl & O. Ettl
- Platymonas bichlora H. Ettl & O. Ettl
- Platymonas bilobata Roukhiyainen
- Platymonas bolosiana Magalef
- Platymonas chui (Butcher) Parke
- Platymonas contracta N. Carter
- Platymonas convolutae Parke & Manton
- Platymonas cordiformis (Carter) Korshikov
- Platymonas elliptica G. M. Smith
- Platymonas flos-aquae (Woronichin) Matvienko
- Platymonas fontiana Magalef
- Platymonas gracilis Kylin
- Platymonas hazenii (Butcher) Desikachary
- Platymonas helgolandica Kylin
- Platymonas helgolandica var. tsingtaoensis Tseng & T.J. Chang
- Platymonas impellucida McLachlan & Parke
- Platymonas incisa Nygaard
- Platymonas intermedia Nasr
- Platymonas lilloensis Conrad & Kufferath
- Platymonas madrasensis Iyengar
- Platymonas mediterranea (Lucksch) H. Ettl & O. Ettl
- Platymonas mediterranea Roukhiyainen
- Platymonas roscoffensis P.A. Dangeard
- Platymonas subcordiformis (Wille) Hazen
- Platymonas suecica Kylin
- Platymonas tetrathele G.S. West
- Platymonas velox Hollande, Enjumet & Lafaurie
- Platymonas viridis Roukhiyainen
- Platymonas willei Kylin
- PLATYSIPHON Wilce
- Platysiphon verticillatus Wilce
- PLATYSIPHONIA Kützing {sectio of Polysiphonia}
- PLATYSIPHONIA J. Agardh {"tribus" of Bostrychia}
- PLATYSIPHONIA Boergesen
- Platysiphonia caribaea Ballantine & Wynne
- Platysiphonia clevelandii (Farlow) Papenfuss
- Platysiphonia corymbosa (J. Ag.) Womersley & Shepley
- Platysiphonia decumbens Wynne
- Platysiphonia delicata (Clemente) J. Cremades
- Platysiphonia hypneoides (Harvey) Womersley & Shepley
- Platysiphonia intermedia (Grunow) Papenfuss
- Platysiphonia intermedia (Grunow) Papenfuss ex Silva & Cleary
- Platysiphonia intermedia (Grunow) Wynne
- Platysiphonia marginalis Wynne, Millar & Kraft
- Platysiphonia miniata (C. Agardh) Boergesen
- Platysiphonia mutabilis (Harvey) Womersley & Shepley
- Platysiphonia mutabilis (Harvey) Wynne {retain}
- Platysiphonia parva Silva & Cleary
- Platysiphonia victoriae (J. Agardh) Womersley & Shepley
- PLATYTHALIA Sonder
- Platythalia angustifolia Sonder
- Platythalia brandegeei (Setchell & Gardner) Womersley
- Platythalia quercifolia (Turner) Sonder
- PLATYTHAMNION J. Agardh
- PLATYTHAMNION (J. Agardh) A. Athanasiadis {subgenus of Pterothamnion}
- Platythamnion capense Stegenga
- Platythamnion crispum (Ducluzeau) J. Feldmann
- Platythamnion cuspidatum Wollaston
- Platythamnion francisianum Wollaston
- Platythamnion heteromorphum (J. Agardh) J. Agardh
- Platythamnion heteromorphum f. typicum Setchell & Gardner
- Platythamnion heteromorphum f. reversum Setchell & Gardner
- Platythamnion horridum Tokida & Inaba
- Platythamnion intermedium Tokida
- Platythamnion lindaueri (G. Feldmann) N.M. Adams
- Platythamnion nodiferum (J. Agardh) Wollaston
- Platythamnion orbignianum (Montagne) J. Agardh
- Platythamnion pectinatum Kylin
- Platythamnion pectinatum var. laxum W.R. Taylor
- Platythamnion polysporum ('polyspora') Itono
- Platythamnion recurvatum Wollaston
- Platythamnion reversum (Setchell & Gardner) Kylin
- Platythamnion reversum var. laxum W.R. Taylor
- Platythamnion tepocense Dawson
- Platythamnion villosum Kylin
- Platythamnion yezoense Inagaki
- PLATYTHECA Stein
- Platytheca micropora Stein
- PLAXONEMA Tangl
- Plaxonema oscillans Tangl
- Plectanium simplex Cleve
- PLECTENCHYMELLA Kraicz
- Plectenchymella bohemica Kraicz
- PLECTODERMA Reinsch
- Plectoderma majus Reinsch
- Plectoderma minus Reinsch
- PLECTODINIUM Biecheler
- Plectodinium nucleovolvatum Biecheler
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