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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium intermedium
Delponte

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 [Cristatae]: Cell surface granulated, gnarled or spiny; semicells half circle, half ellipsoid (Illustrations of The Japanese Fresh-water Algae, 1977).

Species: Cell body (64-82)-79 μm long, 53-64.5 μm wide, L/W=1.20-1.25, isthmus 19-(19.6-25.8) μm wide; semicells covered with radially-arranged granules; frontal view half-circular, lateral view ovoid-circular, apical view ellipsoidal (Illustrations of the Japanese Fresh-water Algae, 1977).
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Cosmarium intermedium
C. intermedium ?
or C. margaritiferum ?
or C. botrytis ?
65 x 52 μm
Kayoicho-ike
Fukuoka, 2001
Cosmarium intermedium
C. intermedium ?
or C. margaritiferum ?
60 x 47 μm
Kayoicho-ike
Fukuoka, 2001
Cosmarium
C. intermedium ?
or C. margaritiferum ?
52 x 43 μm
Kawagoe
Saitama, 2001
Cosmarium
C. intermedium ?
52 x 42 μm
Sai-ko
Saitama, 2001
Cosmarium
C. intermedium
or C. margaritiferum ?
56 x 44 μm
Chiba-Minato p.
Chiba, 2003
Cosmarium vexatum
C. intermedium
or C. margaritiferum ?
55 x 45 μm
Tsurugashima
Chiba, 2003
Similar species -->> C. margaritiferum; C. botrytis; C. logiense; C. pachydermum;

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Cosmarium intermedium
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