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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 ?, cell body μm long, μm wide, L/W=, isthmus μm wide, x 640, Chigo-ike (marsh pond) at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, July 20, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum monticulosum Staurastrum monticulosum Staurastrum monticulosum

Images of collecting locality: Chigo-ike (marsh pond) at the top of Yakebitai mountain, Shiga highland (Oku-shiga highland), Yamanouchi town, Nagano Pref., Japan, July 20, 2008 by Y. Tsukii

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