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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum gracile
Ralfs var. subtenuissimum Woronichin

Staurastrum gracile 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:

Staurastrum gracile Ralfs var. subtenuissimum Woronichin ?, cell body 22 μm long, 26 μm wide (including spines), isthmus 6 μm wide, x 400, x 640, Shimo-no-koike (small pond), 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 gracile Staurastrum gracile Staurastrum gracile Staurastrum gracile Staurastrum gracile

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