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) |
31 μm
63 μm
94 μm; x 640
