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 [ var. cuspidatum ]: Cell body (19.6-25.8)-31 μm long, (15.4-22.4)-28 μm wide, L/W=1.3, isthmus 4.2-7 μm wide; semicells inverted triangle in shape, apical and lateral margins slightly convexed, with a single elongated spine at each corner extended inward; apical view triangular, each side concaved, corners rounded (Illustrations of The Japanese Fresh-water Algae, 1977)

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31 μm 63 μm 94 μm; x 640

Images of collecting locality: No.1, Hikage marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 1, 2006 by Y. Tsukii