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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum aculeatum
var japonicum Hirano

Staurastrum aculeatum 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: cell body 41 μm long, 473 μm wide (with spines), constriction 13 μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977)

Staurastrum aculeatum var. japonicum Hirano, cell body about 35 μm long, 50 μm wide (including arms, about 8 μm), L/W=, isthmus μm wide, x 640, Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 :
Staurastrum Staurastrum Staurastrum Staurastrum Staurastrum

Images of collecting locality: Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city (formerly Azumi village), Nagano Pref., Japan, June 8, 2006 by Y. Tsukii

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