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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum asteroideum
var. nanum (Wille) Grünblad

Staurastrum 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 asteroideum var. nanum (Wille) Grünblad (or S. incisum Wolle ?), cell body 23 μm long, 23 μm wide, L/W=1.0, isthmus 8 μm wide, x 640, Mida-ga-hara (bog), Gassan (mountain), Haguro & Tachikawa town, Yamagata Pref., Japan, July 10, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum Staurastrum Staurastrum

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