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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum avicula
Brébisson in Ralfs var. subarcuatum (Wolle) W. et. G.S. West

Staurastrum avicula 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 avicula Brébisson in Ralfs var. subarcuatum (Wolle) W. et. G.S. West cell body μm long, μm wide, L/W=, isthmus μm wide, x 640, a small marsh pond near Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum avicula Staurastrum avicula Staurastrum avicula Staurastrum avicula Staurastrum avicula

Images of collecting locality: a small marsh pond near Dojo-ike (pond), Norikura highland, Azumi, Matsumoto city, Nagano Pref., Japan, November 4, 2007 by Y. Tsukii

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