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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium lundellii
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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 [ Cyclidium ]: Cell surface smooth; semicells half circle, half ellipsoid (Illustrations of The Japanese Fresh-water Algae, 1977).

Species [ var. circulare ]: Cell body circular or broad elliptical, 53-73 μm long, 48-56 μm wide, isthmus 17-25 μm wide; semicells semicircular.
[ var. ellipticum ]: Cell body elliptical, 50-73 μm long, 42-56 μm wide, isthmus 14-24 μm wide, L/W=1.1-1.3 (Illustrations of The Japanese Fresh-water Algae, 1977).
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Cosmarium lundellii
C. lundellii
var. circulare
76 x 68 μm
Ishinazaka
Furukawa
Miyagi, 2003
Cosmarium
C. lundellii
var. circulare
65 x 56 μm
Water field
Kusu
Oita, 2008
Cosmarium
C. lundellii
var. circulare
57 x 48 μm
Higashi-sano
Hakuba
Nagano, 2004
Cosmarium
C. lundellii
var. circulare
μm
Nabekura HL
Iiyama
Nagano, 2008
Cosmarium lundellii
C. lundellii
var. circulare
49 x 42 μm
Umi-no-nakamichi
Fukuoka, 2001
Cosmarium lundellii
C. lundellii
var. circulare ?
or var. ellipticum ?
45 x 33 μm
Kayoicho-ike
Fukuoka, 2001
Cosmarium lundellii
Similar species -->> C. pachydermum;

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Cosmarium lundellii
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