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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium trachypleurum
Lundell var. cornutum Borge

Cosmarium trachypleurum Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation (Illustrations of The Japanese Fresh-water Algae, 1977).
Species:
Similar species-->> C. furcatospermum;


Cosmarium trachypleurum Lundell var. cornutum Borge ?, cell body 49 μm long, 40 μm wide, L/W=1.2, isthmus 14 μm wide, x 640, a small marsh pond at Iwakagami-gunseichi (gregarious flowering area of Scizocodon soldanelloides), near Nagori-ga-hara (bog), Sukawa highland, Kurikoma mountain, Ichinoseki city, Iwate Pref., Japan, June 24, 2007 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium trachypleurum Cosmarium trachypleurum

Images of collecting locality: a small marsh pond at Iwakagami-gunseichi (gregarious flowering area of Scizocodon soldanelloides), near Nagori-ga-hara (bog), Sukawa highland, Kurikoma mountain, Ichinoseki city, Iwate Pref., Japan, June 24, 2007 by Y. Tsukii


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