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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium oblongum
Bennett

Cosmarium oblongum Species: Cell body small in size, 50-56 μm long, 22-23 μm wide, L/W=2-2.5, slightly constricted at the center; semicells elongate ellipsoidal in shape, cell wall smooth; chloroplast laminae ridged and radially arranged (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. cucurbita;

Cosmarium oblongum Bennett ?, cell body 41 μm long, 17 μm wide, L/W=2.4, isthmus 15 μm wide, x 640, Kannon-numa Forest Park (pond), Shimogo town, Fukushima Pref., Japan, September 10, 2005, collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium oblongum

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