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: Cell body 29 μm long, 37 μm wide, constriction 9 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

Staurastrum with five arms, cell body 23 μm long, μm wide, x 400, x 640, August 7-13, 1999, Vermont-Maine USA, by Y Tsukii