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Gamophyceae: Zygnematales: Desmidiaceae

 Euastrum crassum
(Brébisson) Kützing var. crassum

Euastrum crassum Subgenus: Entomum (Apical area deeply indented or notched)
Section: Incisa (Cell surface smooth; apical area without spiny projections)
Species: Cell body large, (158-162)-205 μm long, (81-84)-106 μm wide, L/W=2, isthmus (25-26)-30 μm wide; semicells rectangular in shape, each consisting of 3 lobes; lateral lobes large, elongate rectangular, slightly concaved; cell wall covered with small pores (Illustrations of The Japanese Fresh-water Algae, 1977).
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Euastrum crassum (Brébisson) Kützing var. crassum, semicell 100 μm long, 96 μm wide, L/W=, isthmus μm wide, x 640, No.2, Numappara marsh, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, September 3, 2007 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400; scale 31 μm scale 63 μm scale 94 μm; x 640
Euastrum crassum Euastrum crassum
Cell body 185 μm long, 92 μm wide, L/W=2.0, isthmus 26 μm wide, x 640
Euastrum crassum Euastrum crassum Euastrum crassum

Images of collecting locality: No.2, Numappara marsh, Nasu-shiobara city (formerly Kuroiso city), Tochigi Pref., Japan, September 3, 2007 by Y. Tsukii

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