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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium impressulum
Elfving var. impressulum

Cosmarium impressulum 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 small, (21-29.5)-36 μm long, (15.4-18)-26 μm wide, isthmus 5-(5.6-7)-9 μm wide, L/W=1.5; both sides of semicells with four wavy margins, all waves equal in size, side view elongated ellipsoid; cell wall smooth (Illustrations of The Japanese Fresh-water Algae, 1977).


Cosmarium impressulum Elfving var. impressulum, cell body 29 μm long, 19 μm wide, constriction 6 μm wide, x 400, x 640, Saitama Pref., Japan, May-June 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 Cosmarium Cosmarium


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