Species: Colonies of 2, 4, 8, 16 cells, enclosed by a fusiform gelatinous sheath; cell body elongated fusiform to slightly asymmmetric fusiform, narrowed into the pointed ends, 20-35 μm long, 3-4 μm wide; chloroplasts a single, parietal, laminate, with one or two pyrenoids (Photomicrographs of the Freshwater Algae, 15: 35, 1995).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.11, Kannon-numa Forest Park (pond/marsh), Shimogo town, Fukushima Pref., Japan, November 15, 2008, by Y. Tsukii