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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium laeve
Rabenhorst var. laeve

Cosmarium laeve 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: Cell body 15-(18-32)-34 μm long, 11.5-(12.6-22.4)-23 μm wide, L/W=1.5, isthmus 2.8-8 μm wide, semicells half-ellipsoidal or rounded pyramidal, apices slightly depressed, cell wall with a small number of dots; a single chloroplast with a pyrenoid in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -- >> C. granatum;


Cosmarium laeve Rabenhorst var. laeve, cell body 30 μm long, 23 μm wide, L/W=, isthmus 6 μm wide, x 640, Ho-daisan-koen (park), Ho, Yoshikawa city, Saitama Pref., Japan, April 9, 2009 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium laeve

Images of collecting locality: Ho-daisan-koen (park), Ho, Yoshikawa city, Saitama Pref., Japan, April 9, 2006 by Y. Tsukii


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