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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium granatum
Brébisson ex Ralfs var. granatum

Cosmarium granatum Species [ var. granatum ]: Cell body small in size, (22.5-39)-47 μm long, (15.4-24)-30 μm wide, isthmus (5.6-8.6)-9 μm wide, L/W=1.7, isthmus (5.6-8.6)-9 μm wide; semicells pyramidal in shape, apex slightly flattened, side view elliptical ovoid, apical view elliptial; cell wall dotted.
[ var. subgranatum ]: Upper half of lateral margins wavy; 24-30 μm long, 17-22 μm wide, isthmus 6-9 μm wide.
[ var. ocellatum ]: A small pore present at the center of semicells, 38-44 μm long, 26-28 μm wide, isthmus 6-9 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).


Cosmarium granatum Brébisson ex Ralfs or similar species, cell body 37 μm long, 27 μm wide, L/W=1.4, x 640, Otto-Numa (pond) Chosei-chi, Tsuchiura city, Ibaraki Pref., Japan, July 2002 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium


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