Genus: Filament without branching; cell body cylindrical; two chloroplasts star-shaped; tubes formed (or cell body fused) at conjugation; zygospore spherical or broad ellipsoidal formed within female gametangium (Guide book to the "Photomicrographs of the Freshwater Algae", 1998). Species:

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.2, Imou bog, Toyohashi city, Aichi Pref., Japan, September 24, 2006 by Y. Tsukii