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).
Images of collecting locality:
Water field near Ouchi middle school, Yuri-Honjo city, Akita Pref., Japan, September 28, 2008 by Y. Tsukii