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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium angulosum
Brébisson var. angulosum

Cosmarium angulosum Species [ var. angulosum ]: Cell body small, 14-31 μm long, 12.6-21 μm wide, L/W=1.5, isthmus 3.4-6 μm wide; semicells quadrate or hexagonal in shape.
[ var. concinnum ]: Smaller than var. angulosum, (11-12)-13 μm long, 8-12 μm wide, L/W=1.3, isthmus 2.6-4.5 μm wide (Illustrations of the Fresh-water Algae, 1977).

Cosmarium angulosum Brébisson angulosum, cell body 29 μm long, 17 μm wide, L/W=1.7, isthmus 4 μm wide, , x 640, No.1, Near Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, October 12, 2008 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium angulosum Cosmarium angulosum Cosmarium angulosum

Images of collecting locality: a pond near the entrance of climbing route to Omine mountain, Minakami town, Gunma Pref., Japan, October 12, 2008 by Y. Tsukii

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