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.6, Tashirodaira marsh, Hakkoda mountain, Aomori city, Aomori Pref., Japan, September 13, 2006 by Y. Tsukii