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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum monticulosum
Brébisson var. bidens W. et G.S. West

Staurastrum pileatum 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:

Staurastrum monticulosum Brébisson var. bidens W. et G.S. West ? or similar species, cell body 23 μm long, 21 μm wide, L/W=1.1, isthmus 9 μm wide, x 640, Tanohara marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, September 26, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum
Cell body 25 μm long, 22 μm wide, L/W=1.1, isthmus 11 μm wide, x 640
Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum

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