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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium pachydermum
P. Lundell var. pachydermum

Cosmarium pachydermum Species [var. pachydermum]: Cell body 78-117 μm long, 60-87 μm wide, isthmus 25-34 μm wide, semicells semielliptical in shape, corners rounded.
[var. aethiopicum W. et G.S. West ]: Semicells nearly half-circle; cellwall thin; cell body 64-107 μm long, 56-80 μm wide, isthmus 28-34 μm wide.
[var. ellipticum Hinode ]: Semicells rectangular at base; curvature of lateral margins weak compared to var. pachydermum; cell body 94-100 μm long, 67-74 μm wide, isthmus 28-34 μm wide.
[var. heptagonum Grönblad ]: Semicells irregular pentagon in shape; posterior half of lateral margins nearly straight; cell body 94-100 μm long, 67-74 μm wide, isthmus 28-34 μm wide (Illustrations of The Japanese Fresh-water Algae, 1977).
Similar species -->> C. lundellii;


Cosmarium pachydermum P. Lundell var. pachydermum, cell body 85 μm long, 65 μm wide, L/W=1.3, isthmus 23 ? μm wide, x 640, rice field next to Uehara-ike (pond), Ueda city, Nagano Pref., Japan, July 6, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium

Images of collecting locality: Rice field next to Uehara-ike (pond), Ueda city, Nagano Pref., Japan, July 6, 2006 by Y. Tsukii


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