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Gamophyceae: Zygnematales: Desmidiaceae

 Staurastrum tetracerum
f. trigona Lundell

Staurastrum tetracerum 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 tetracerum f. trigona Lundell, cell body 20 μm long, 18 μm wide (including arms), L/W=, isthmus 6 μm wide, x 640, No.5, Kashibaru marsh, Karatsu city, Saga Pref., Japan, November 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Staurastrum tetracerum Staurastrum tetracerum Staurastrum tetracerum

Images of collecting locality: No.5, Kashibaru marsh, Karatsu city, Saga Pref., Japan, November 22, 2006 by Y. Tsukii

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