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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium margaritiferum
Meneghini ex Ralfs

Cosmarium margaritiferum Species: Cell body elliptical, 50-(56-60) μm long, 42-(48-56) μm wide, isthmus 13-(15-17) μm wide, L/W=1.3; semicells pyramid-shaped with flattened apex, basal corner broadly rounded, both sides convex with wavy margin (about 10-13 waves or granules), apex flat (waves/granules absent); cell wall covered with uniformely arranged granules interspersed by small pores, side view elliptical; chloroplasts with 2 pyrenoids in each semicell (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium margaritiferum Meneghini ex Ralfs, cell body 50 μm long, 43 μm wide, isthmus μm wide, L/W=1.2, 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 sp., cell body 50 μm long, 45 μm wide, constriction μm wide, L/W=1.1, 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

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