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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum cuneatum
Jenner

Euastrum Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body medium in size, 90-101 μm long, 48-50 μm wide, L/W=2, isthmus 14-17 μm wide; semicells pyramid-shaped with narrowly flattened apex; lateral margins nearly straight or somewhat wavy; cell wall dotted or with many small pores, bulging inconspicuous (Illustrations of The Japanese Fresh-water Algae, 1977).

Euastrum cuneatum Jenner, cell body 99 μm long, 58 μm wide, L/W=1.7, isthmus 17 μm wide, x 640, No.4, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum cuneatum Euastrum cuneatum
Cell body μm long, μm wide, L/W=, isthmus μm wide, x 640
Euastrum cuneatum
Cell body 105 μm long, 59 μm wide, L/W=1.8, isthmus 20 μm wide, x 640
Euastrum cuneatum Euastrum cuneatum

Images of collecting locality: No.4, a marsh pond at Sensho-ga-hara, near Akita-komagadake (mountain), Shizukuishi town, Iwate Pref., Japan, August 6, 2007 by Y. Tsukii

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