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: with arm-like projections (Illustrations of The Japanese Fresh-water Algae, 1977) Species [var. ornatum]: Cell body 43-58 μm long (excluding arms), 47-94 μm long (including arms), 19-24 μm wide (excluding arms), 90-103 μm wide (including arms), isthmus 11-13 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)

50 μm 100 μm 150 μm; x 400 : 31 μm 63 μm 94 μm; x 640

Images of collecting locality: Lake Biwa near Irie bridge, Maibara city (formerly Maihara town), Shiga Pref., Japan, June 30, 2008, by Y. Tsukii