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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium hammeri
var. protuberans W. et G.S. West

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 [Eucosmarium]: Cell body dorso-ventrally compressed, with strong constriction at the center, transverse section elliptical or diamond-shaped.
Section [Pyramidatae]: Cell surface smooth; semicells pyramidal with flattened apex or trapezoid (Illustrations of The Japanese Fresh-water Algae, 1977).

Species:
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Apex flatted, semicell scalariform
Cosmarium hammeri
C. hammeri
v. protuberans
μm
Miyatoko m.5
Minami-Aizu
Fukushima, 2008
Euastrum
C. hammeri
v. protuberans
28 x 20 μm
L/W=1.3
Hiroshima, 1998
Euastrum
C. hammeri
v. protuberans
27 x 23 μm
L/W=1.2
USA, 1999
Euastrum
C. hammeri
v. protuberans
26 x 22 μm
L/W=1.2
Uruguay, 1999
Cosmarium hammeri
C. hammeri
v. protuberans
μm
Maruta-ike
Maibaru
Fukuoka, 2008
Cosmarium hammeri
C. hammeri
v. protuberans
μm
Kareki-numa
Nikko
Tochigi, 2008
Cosmarium hammeri
C. hammeri
v. protuberans
μm
Kashibaru marsh
Karatsu
Saga, 2008
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Cosmarium hammeri
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