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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum didelta
Ralfs var. didelta

Euastrum Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body 115-150 μm long, 53-70 μm wide, L/W=2.0, isthmus 18-26 μm wide; (Illustrations of The Japanese Fresh-water Algae, 1977).

Euastrum didelta Ralfs var. didelta, cell body 115 μm long, 65 μm wide, L/W=1.8, isthmus 18? μm wide, x 640, Iroha-numa (marsh), Zao mountain, Yamagata city, Yamagata Pref., Japan, July 9, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum didelta Euastrum didelta

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