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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium margispinatum
Hirano var. margispinatum

Cosmarium margispinatum 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, covered with spines, sinus open outward, 53-60 μm long, 50-53 μm wide, isthmus 20-26 μm wide; semicells nearly semicircular, basal corner rounded, apex smooth, apical view elliptical (Photomicrographs of the Fresh-water Algae, vol. 3, 1985).


C. margispinatum Hirano var. margispinatum, cell body 60 μm long, 48 μm wide, isthmus 27 μm wide, with short spines, x400, x 640, Hiroshima Pref., Japan, October 1998, 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 Cosmarium Cosmarium

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