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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum gnathophorum
W. et G.S. West

Euastrum gnathophorum Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body 47-73 μm long, 34-36 μm wide, isthmus 11-14 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Euastrum gnathophorum W. et G.S. West, cell body μm long, μm wide, L/W=, isthmus μm wide, x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum gnathophorum Euastrum gnathophorum

Images of collecting locality: Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, August 2, 2008 by Eizaburo Tsukii

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