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: Cell body 29 μm long, 37 μm wide, constriction 9 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977)
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S. incisum
43 x μm
near Yamaguchi Univ.
Yamaguchi, 2004
S. incisum
x 35 μm
near Yamaguchi Univ.
Yamaguchi, 2004
S. incisum
S. asteroideum ?
26 x 36 μm
Aizu Recreation p.
Aizuwakamatsu
Fukushima, 2005
S. incisum
25 x 36 μm
Tane-ike
Togakushi highland
Nagano, 2005
S. incisum
32 x μm
Shijuhachi-ike
Shiga highland
Nagano, 2008
S. incisum ??
23 x μm
Vermont-Maine
USA, 1999
