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Gamophyceae: Zygnematales: Desmidiaceae

 Cosmarium moniliforme
Turpin ex Ralfs f. moniliforme

Cosmarium moniliforme Species [f. moniliforme]: Cell body 21-56 μm long, 11-29 μm wide, isthmus 4-11 μm wide, L/W=2; semicells spherical; cell wall smooth.
[f. punctata Lagerheim ]: Cell wall dotted; 24-43 μm long, 14-25 μm wide.
[f. elliptica Lagerheim ]: Cell body elongated, semicells broad ellipsoid in shape; 46-50 μm long, 28-32 μm wide.
[f. supyriforme W. et G.S. West ]: Semicells inverted ovoid, apex slightly flatted; 34-56 μm long, 21-23 μm wide.
[f. elongata W. et G.S. Wetst ]: Cell body 2 times longer than f. moniliforme, semicells ellipsoidal; 38-42 μm long, 17-22 μm wide.
[f. pandriforme Heimerl ]: Smaller than f. moniliforme; 17.5-20 μm long, 10-15 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).

Cosmarium moniliforme Turpin ex Ralfs f. moniliforme (or Cosmarium contractum f. jacobsenii ?), cell body 38.5 μm long, 23.5 μm wide, L/W=1.6, isthmus 6.5 μm wide, x 640, Ushidome-ike (pond), Norikura highland, Azumi village, Nagano Pref., Japan, May 28, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium moniliforme
Cell body 37 μm long, 24 μm wide, L/W=1.5, isthmus 7 μm wide, x 640
Cosmarium moniliforme
Cell body 34 μm long, 19 μm wide, L/W=1.8, isthmus 7 μm wide, x 640
Cosmarium moniliforme Cosmarium moniliforme

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