Genus: Cell body short, radiate in shape; apical view of the cell, triangular, polygonal, ellipsoidal or spindle-shaped; zygospores formed outside of mother cells (Illustrations of The Japanese Fresh-water Algae, 1977) Subgenus: lacks arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977) Species:

31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.2, Chigo-ike marsh (or Yakebitai marsh) at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, July 20, 2008 by Y. Tsukii