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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 63 μm long, 50 μm wide, isthmus 15 μm wide, L/W=1.3, x 640, water field near Takao bridge, near Takao-sakura park, Kitamoto city, Saitama Pref., April 17, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium margaritiferum Cosmarium margaritiferum
Cell body 60 μm long, 47 μm wide, isthmus 16 μm wide, L/W=1.3, x 640
Cosmarium margaritiferum
Cell body 55 μm long, 44 μm wide, isthmus 17 μm wide, L/W=1.3, x 640
Cosmarium margaritiferum Cosmarium margaritiferum
Cell body 54 μm long, 44 μm wide, isthmus 18 μm wide, L/W=1.2, x 640
Cosmarium margaritiferum Cosmarium margaritiferum

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