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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 or Cosmarium vexatum W. West ?, cell body 56 μm long, 43 μm wide, constriction 17 μm wide, x 640, Kurihashi, Saitama Pref., Japan, July 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium

Cosmarium margaritiferum, cell body 59 μm long, 43 μm wide, constriction 16 μm wide, x 640, Kurihashi, Saitama Pref., Japan, July 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium Cosmarium

Cosmarium margaritiferum, cell body 57 μm long, 48 μm wide, constriction 18 μm wide, x 640, Kurihashi, Saitama Pref., Japan, July 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

Cosmarium margaritiferum, cell body 54 μm long, 45 μm wide, constriction 18 μm wide, x 640, Kurihashi, Saitama Pref., Japan, July 2001 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium Cosmarium

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