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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium subrectangulare
Gutwinski

Cosmarium subrectangulare Species: Cell body 31-33.6 μm long, 27-28 μm wide, isthmus 7-8 μm wide; semicells hexagonal in shape, central width larger than basal & apical ones; apex flat with slightly swelled corners; apical view more or less diamond-shaped, with central bulges on both sides (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. rectangulare (Quadratiformes);

Cosmarium subrectangulare Gutwinski (or C. sexangulare Lundell ?), cell body 37 μm long, μm wide, L/W=, x 640, Aquatic botanical garden, Sawara city, Chiba Pref., Japan, October 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium subrectangulare Cosmarium subrectangulare

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