Genus: Without gelatinous sheath; without branching; filaments consist of many cells; planktonic;
cell body cylindrical, apex of terminal cells rounded; septum slightly constricted;
a parietal chloroplast plate-like with one or two pyrenoids
(Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Images of collecting locality:
No. 2, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii