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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium suborthogonum
Raciborski

Cosmarium subortogonum 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 suborthogonum (or C. subortogonum ?) Raciborski (Pyramidatae), or Cosmarium subcrenatum var. nordstedtii Schmidle ??), cell body 23 μm long, 21 μm wide, isthmus 6 μm wide, x 640, rice field, Yasuji-kawa, Sawara city, Chiba Pref., Japan, October 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

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