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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium sportella
Brébisson

Section [Margaritiferae]: Cell surface granulated, gnarled or spiny; semicells pyramidal with flattened apex or trapezoid (Illustrations of The Japanese Fresh-water Algae, 1977).
Species (var. subnudum): Cell body (42)-51 μm long, (33.6)-41 μm wide, isthmus 11-(14.5) μm wide, apex slightly depressed; (Illustrations of The Japanese Fresh-water Algae, 1977).
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var. sportella: Large granules present at the center; apex flat
Cosmarium sportella
C. sportella
var. sportella
37 x 31 μm
Yasuji-kawa
Sawara
Chiba, 2004
Cosmarium
C. sportella
var. sportella ?
42 x 36 μm
USA, 1999
Cosmarium Cosmarium
var. subnudum: Granules absent at the center; apex slightly depressed
Cosmarium
C. sportella
var. subnudum
48 x 38 μm
Hiroshima, 1998
Movies
Cosmarium
C. sportella
var. subnudum
47 x 38 μm
Shimo-muneoka
Shiki
Saitama, 2004
Cosmarium
C. sportella
var. subnudum
42 x 33 μm
Saitama, 1999
Cosmarium sportella
C. sportella
var. subnudum ?
46 x 41 μm
Kuroiso Park
Kuroiso
Tochigi, 2003
Cosmarium sportella
C. sportella
var. subnudum ?
45 x 37 μm
Koigakubo marsh
Tessei-cho
Okayama, 2004
Cosmarium sportella
C. sportella
var. subnudum
or v. sportella ?
38 x 34 μm
Ikenokochi marsh
Tsuruga
Fukui, 2004
Cosmarium Cosmarium Cosmarium
Similar species -- >> C. vexatum; C. botrytis;

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Cosmarium sportella
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