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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium

Subgenus: Eucosmarium

Genus: Unicellular; variable in shape; a constriction at the center of the cell body; mostly longer than wide; flattened; each semicell hemispherical, spherical, ellipsoidal, rectangular, pyramidal or kidney-shaped; no apical indentation.
Subgenus:Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).
Section Cristatae: Cell surface granulated, gnarled or spiny; semicells semicircular, semi-elliptical
All margins granulated, gnarled or spiny
Cosmarium heterodentatum
C. heterodentatum
2 samples
114 x 72 μm
2004-2008
Cosmarium intermedium
C. intermedium ?
or C. margaritiferum ?
6 samples
52-65 μm
2001-2003
Cosmarium
C. margispinatum
var. cornutum
60 x 48 μm
Hiroshima, 1998
Movies
Cosmarium
C. echinodermum
36 x 37 μm
USA, 1999
Cosmarium quadrifarium
C. quadrifarium
32 samples
41-60 μm
2003-2008
Cosmarium
Cosmarium sp.5
14 x 13 μm
USA, 1999
Margins crenated
Cosmarium
C. nasutum
32 x 29 μm
Saitama, 1999
Cosmarium caelatum
C. caelatum
v. spectabile
48 x 40 μm
Shimizu-daira
Nasu
Tochigi, 2005

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Cosmarium
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