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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 40 μm long, 20 μm wide, L/W=2-2.5, isthmus 17.5 μm wide, x 640, Hikage marsh, Shiga highland, Yamanouchi town, Nagano Pref., Japan, June 19, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium oblongum Cosmarium oblongum Cosmarium oblongum

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