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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium margaritatum
(P. Lundell) J. Roy et Bisset var. margaritatum

Cosmarium margaritatum Species: Cell body 78-90 μm long, 70-72 μm wide, L/W=1.20-1.25, isthmus 22-25 μm wide; semicells subrectangular, basal angles rounded, lateral margins convex, anical angles broadly rounded, apex truncate and flat; cell wall regularly granulated, between the granules finely punctated; side view of the semicells subcircular, vertical view oblong-elliptic; zygospores spherical or slightly depressed, with yellowish smooth wall, surrounded by mucilagenous sheath, 44.8-47.6 μm in diam. (Photomicrographs of the Freshwater Algae, vol. 3, 1985).
Similar species -->> C. logiense; C. quadrum;


Cosmarium margaritatum (P. Lundell) J. Roy et Bisset var. margaritatum, cell body 79 μm long, 84 μm wide, isthmus 22 μm wide, x 640, rice field, near City Hall, Fujimi city, Saitama Pref., Japan, July 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium margaritatum Cosmarium margaritatum


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