Genus: Filament with branching; cell body cylindrical; a single chloroplast plate-like, slightly curved,
with 1 to several pyrenoids; apical cells pointed or drawn out as hairly projections;
no difference between axial and branching filaments; forming a large clump attached on a substrate
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Images of collecting locality:
Akasaka-numa (pond), Iwatsuki-ku (formerly Iwatsuki city), Saitama city, Saitama Pref., Japan, February 12, 2006 by Y. Tsukii