Species: Cell body not curved, spindle or boat in shape; 24-(35-84)-93 μm long, 8-(11-20)-22 μm wide; L/W = 3-4; a single chloroplast and 1 or 2 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

31 μm 63 μm 94 μm; x 640

Images of collecting locality: Togakushi forest botanical garden, Togakushi highland, Nagano city (formerly Togakushi village), Nagano Pref., Japan, May 21, 2006 by Y. Tsukii