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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium furcatospermum
W. et G.S. West var. furcatospermum

Cosmarium Species [ var. furcatospermum ]: Cell body 18-(19.6-29) μm long, 16.5-(18-25) μm wide, isthmus 5.6-8.4 μm wide; semicells semicirucular with flattened apex, margins wavy (laterally 4-5 waves, apically 4 waves); two rows of granules radially arranged within the margin; central region smooth (lacks granules or other ornaments).
[ var. koreanum Skvortzow ]: 31-32 μm long, 25-28 μm wide, isthmus 8-11 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium furcatospermum W. et G.S. West var. furcatospermum (Margaritiferae), cell body 19 μm long, 16 μm wide, L/W=, isthmus μm wide, x 640, Kareki-numa marsh, Nikko city (formerly Fujiwara town), Tochigi Pref., Japan, September 24, 2008 collected by Eizaburo Tsukii, photo by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium furcatospermum Cosmarium furcatospermum

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