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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium subcucumis
Schmidle var. subcucumis

Cosmarium subcucumis Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species: cell body (49-61)-78 μm long, (28-39)-45 μm wide, L/W = 1.5, constriction (17-20) μm wide, (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium subcucumis var. subcucumis (or C. pseudopyramidatum Lundell var. pseudopyramidatum ?), cell body 71 μm long, 39 μm wide, L/W=1.8, isthmus 20 μm wide, x 640, Iyari marsh, Omachi city, Nagano Pref., Japan, May 8, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium pseudopyramidatum Cosmarium pseudopyramidatum

Images of collecting locality: Iyari marsh, Omachi city, Nagano Pref., Japan, May 8, 2006 by Y. Tsukii

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