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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 85 μm long, 50 μm wide, L/W=1.7, isthmus 10 μm wide, x 640, No. 9-1, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum ampullaceum Euastrum ampullaceum
Semicell 42 μm long, 55 μm wide, L/W=, isthmus 11 μm wide, x 640
Euastrum ampullaceum Euastrum ampullaceum

Images of collecting locality: No. 9, Mida-ga-hara (bog/marsh), Gassan (mountain), Tsuruoka city (formerly Haguro town) & Shonai town (formerly Tachikawa town), Yamagata Pref., Japan, August 3, 2006 by Y. Tsukii

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