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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum ampullaceum
Ralfs var. ampullaceum

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

Euastrum ampullaceum Ralfs, cell body 101 μm long, 57 μm wide, L/W=1.8, isthmus 13 μm wide, x 640, Kenashitai (marsh), Hakkoda mountain, Aomori city, Aomori Pref., Japan, July 17, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum ampullaceum Euastrum ampullaceum Euastrum ampullaceum
Cell body 92 μm long, 53 μm wide, L/W=1.7, isthmus 12? μm wide, x 640
Euastrum ampullaceum Euastrum ampullaceum Euastrum ampullaceum
Cell body 96 μm long, 56 μm wide, L/W=1.7, isthmus 13 μm wide, x 640
Euastrum ampullaceum Euastrum ampullaceum Euastrum ampullaceum Euastrum ampullaceum
Cell body 99 μm long, 55 μm wide, L/W=1.8, isthmus 13 μm wide, x 640
Euastrum ampullaceum Euastrum ampullaceum Euastrum ampullaceum

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