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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium orthostichum
Lundell var. subpolonica Messikommer

Cosmarium orthostichum 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 32.3 μm long, 30 μm wide, isthmus 8.6 μm wide; semicells pyramidal with fattened apex; bay closed; granules arranged in 4 rows and about 7 columns, largest 4 granules located at the center of the cell body (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. punctulatum;


Cosmarium orthostichum Lundell var. subpolonica Messikommer, cell body 31 μm long, 28 μm wide, x 400, x 640, Uruguay, November 1999, photo by Yuuji Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium
Cosmarium Cosmarium Cosmarium


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