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

Staurastrum polymorphum var. groenbladii Hirano (left) ? and cell body 17 μm long, 20 μm wide, L/W=0.9, isthmus 7 μm wide, Staurastrum wandae Raciborski var. brevispinum Grönblad (right), cell body 28 μm long, 24 μm wide, L/W=1.2, isthmus 15 μm wide, x 640, a small marsh near prefectural road route 342, Sukawa highland, Kurikoma mountain, Higashi-naruse village, Akita Pref., Japan, June 24, 2007 by Y. Tsukii
31 μm 63 μm 94 μm; x 640

Images of collecting locality: a small marsh near prefectural road route 342, Sukawa highland, Kurikoma mountain, Higashi-naruse village, Akita Pref., Japan, June 24, 2007 by Y. Tsukii