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:

50 μm 100 μm 150 μm; x 400

31 μm 63 μm 94 μm; x 640