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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium binum
Nordsted var. binum

Cosmarium binum Species: Cell body 46-62 μm long, 36-45 μm wide, L/W= 1.25-1.33; semicells pyramidate-trapeziform, apex trucated and 4-6 crenate, lateral margins convex, 6-8 crenate, all the crenations consist of bigranules or emarginations, bicrenate granules arranged radially from the center, which locates just above the isthmus; the 6-7 vertical series of granulte ridges present at the center; side view of the semicells ovate-oblong, convexing at the center for both side; vertical view elliptic-oblong (Photomicrographs of the Freshwater Algae, vol. 3, 1985).


Cosmarium binum Nordsted var. binum, cell body 59 μm long, 43 μm wide, L/W=1.4, isthmus 15 μm wide, x 640, Watari mizube-no-gakkou, riverside park of Abukuma river, Fukushima city, Fukushima Pref., Japan, October 28, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium binum Cosmarium binum Cosmarium binum Cosmarium binum


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