image_list image_listE

Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium maximum
var. minor W. et G. S. West

Cosmarium maximum 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 [var. maximum]: Cell body (92)-114 μm long, (84)-108 μm wide; isthmus 24-(36) μm
[var. minor]: Cell body 63.5-(64.5) μm long, 48.5-(56) μm wide; isthmus 10-(28) μm (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium maximum var. minor, cell body 52 μm long, 47 μm wide, isthmus 29 μm wide, x 400, x 640, Mashiko City, Tochigi-Pref., Japan, November 1999, collected by H. Shiomizu, photo 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

Please click on images for viewing enlarged.
Copyright Protist Information Server