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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum dilatatum
Ehrenberg ex Ralfs var. dilatatum

Staurastrum dilatatum 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 dilatatum Ehrenberg ex Ralfs var. dilatatum, cell body 40 μm long, 33 μm wide, L/W=1.2, isthmus 13 μm wide, x 640, a pond near the entrance of climbing route to Omine mountain, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum dilatatum Staurastrum dilatatum Staurastrum dilatatum Staurastrum dilatatum Staurastrum dilatatum Staurastrum dilatatum

Images of collecting locality: a pond near the entrance of climbing route to Omine mountain, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii

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