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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium obtusatum
Schmidle

Cosmarium 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 medium in size, elliptical hexagon, slightly longer than width, (48-56)-60 μm long, (39-48)-50 μm wide, isthmus 14-17 μm wide; semicells semicircular with flattened apex or trapezoid, both sides wavy (about 8 waves), apex flat or slightly convex, side view broad ovoid (Illustrations of The Japanese Fresh-water Algae, 1977).


Cosmarium obtusatum or C. subcostatum ?, cell body 34 μm long, 27 μm wide, x 400, x 640, Vermont-Maine U.S.A., August 7-13, 1999, by Y. 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

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Cosmarium Cosmarium


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