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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium bioculatum
var. depressum Schaarschmidt

Cosmarium bioculatum Species [ var. bioculatum ]: Cell body small in size (length = width), 15-(18-21) μm long, 15-(17-20)-21 μm wide, isthmus (5-5.5)-6.7 μm wide; semicells elongated ellipsoid, apex flattened, side view nearly circular, apical view elongated ellptical; cell wall smooth, transparent
[ var. depressum ]: Cell body nearly rectangular, each corner rounded, 14.5-(18)-20 μm long, 17-18-(22) μm wide, isthmus 7 μm wide; semicells elongated ellipsoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. depressum; C. contractum;

Cosmarium bioculatum var. depressum Schaarschmidt (similar to var. hians W. et G.S. West ?), cell body 13 μm long, 12.5 μm wide, L/W=1.0, isthmus 4 μm wide, x 640, No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium bioculatum Cosmarium bioculatum

Images of collecting locality: No.6, Omine-numa (pond/marsh), Omine, Minakami town (formerly Tsukiyono town), Gunma Pref., Japan, April 15, 2007 by Y. Tsukii

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