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,
semicell 56 μm long, 48 μm wide, L/W=, isthmus ?? μm wide,
x 640, Oze-shokubutu-kenkyu-mihonen, Oze-ga-hara (Oze marsh), Katashina village, Gunma Pref., Japan, June 29, 2006 by Y. Tsukii
31 μm
63 μm
94 μm; x 640
Images of collecting locality:
Oze-shokubutu-kenkyu-mihonen, Oze-ga-hara (Oze marsh), Katashina village, Gunma Pref., Japan, June 29, 2006 by Y. Tsukii