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 sinuata(W. Smith) Grunow image
Nitzschia sinuata var. constrictaJ.Y. Chen & H.Z. Zhu in Zhu & Chen The algal flora and aquatic fauna of the Wulingyuan Nature Reserve Area, Hunan, China: 36, fig. I: 8 1989
Nitzschia sinuata var. delognei(Grunow) Lange-Bertalot image
Nitzschia sinuata var. denticuloidesBiswas image
Nitzschia sinuata var. svalbardensisFoged Tromsö Museums Skrifter 11: 144, pl. XXII: fig. 1 1964
Nitzschia sinuata var. tabellaria(Grunow) Hustedt in Pascher Süssw.-Fl. 10, 2. Aufl.: 409 1930