Silva Center for Phycological Documentation: Index Nominum Algarum

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

NameAuthorSourceCitationYear
Nitzschia sigma(Kützing) W. Smith image
Nitzschia sigma f. breviorGrunow in Van Heurck Syn. Diat. Belg.: pl. LXVI: fig. 4 1881
Nitzschia sigma f. genuinaCleve image
Nitzschia sigma f. indicaThomas & Gonzalves image
Nitzschia sigma f. maximaGrunow image
Nitzschia sigma var. abludensGrunow image
Nitzschia sigma var. anguillula(Schumann) Grunow image
Nitzschia sigma var. calamaeFrenguelli image
Nitzschia sigma var. clausii(Hantzsch) Grunow image
Nitzschia sigma var. consimilisGrunow image
Nitzschia sigma var. curvula(Ehrenberg) Brun image
Nitzschia sigma var. diminutaGrunow in Van Heurck Syn. Diat. Belg.: pl. LXVI: fig. 9 1881
Nitzschia sigma var. fasciculataGrunow image
Nitzschia sigma var. fonticolaHustedt Arch. Hydrobiol. Suppl. 15: 486, pl. XL: figs. 16, 17 1938
Nitzschia sigma var. genuinaGrunow image
Nitzschia sigma var. habirshawiiGrunow in Van Heurck Syn. Diat. Belg.: expl. pl. LXVI: fig. 4 1881
Nitzschia sigma var. indicaKarsten image
Nitzschia sigma var. intercedensGrunow image
Nitzschia sigma var. maximaGrunow image
Nitzschia sigma var. neogenaGrunow image
Nitzschia sigma var. rigida(Kützing) Grunow image
Nitzschia sigma var. rigidaGrunow in Van Heurck Syn. Diat. Belg.: pl. LXVI: fig. 2 1881
Nitzschia sigma var. rigidulaGrunow in Van Heurck Syn. Diat. Belg.: pl. LXVI: fig. 8 1881
Nitzschia sigma var. robusta Østrup image
Nitzschia sigma var. scabraCleve image
Nitzschia sigma var. serpentinaSkvortzov image
Nitzschia sigma var. sigmatellaGrunow image
Nitzschia sigma var. subcapitataRabenhorst image
Nitzschia sigma var. subrecta(Grunow) Grunow image
Nitzschia sigma var. undulataHohn & Hellerman image
Nitzschia sigma var. validaGrunow image
Nitzschia sigmaformisHustedt image
Nitzschia sigmaformis var. socialisKarajeva image
Nitzschia sigmatellaGregory image
Nitzschia sigmatella var. minorGrunow image
Nitzschia sigmatella var. pusillaGrunow image
Nitzschia sigmatella var. subrectaGrunow image
Nitzschia sigmatoformis var. subrectaProschkina-Lavrenko image