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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium sp.
= Actinotaenium sp.

Cosmarium 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 (Actinotaenium) elongatum ?? (similar to C. clevei or Tetmemorus sp. ?), cell body 51 μm long, 20 μm wide, isthmus 19 μm wide, x 640, Imou bog, Toyohashi city, Aichi Pref., Japan, September 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
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