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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium meneghinii
var. reinschii Istvanffi

Cosmarium meneghinii 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:

Cosmarium meneghinii var. reinschii Istvanffi (similar to C. impressulum Elfving), cell body 18 μm long, 14 μm wide, isthmus 4.5 μm wide, apex slightly concave, x 640, Shimo-no-koike (small pond), Shiga highland, Yamanouchi town, Nagano Pref., Japan, September 26, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium impressulum Cosmarium impressulum

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