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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 furcatospermum (or C. furcatospermum var. koreanum Skvortzow ?), cell body 24 μm long, 21 μm wide, L/W=1.1, isthmus 6 μm wide, x 640, rice field, near Ichinoseki Railroad Station, Ichinoseki city, Iwate Pref., Japan, July 24, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640 s
Cosmarium Cosmarium


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