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Gamophyceae: Zygnematales: Desmidiaceae

Cosmarium alpestre
Roy et Bisset
= Actinotaenium alpestre Roy et Bisset

Cosmarium alpestre
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Species: Cell body (67-76)-90-105 μm long, (50-62)-75-90 μm wide, isthmus (49-56)-79 μm wide, L/W=1.3; semicells half-circular in shape; constriction weak (Illustrations of the Fresh-water Algae, 1977).
Similar species -->> C. connatum;

Cosmarium alpestre Roy et Bisset (small variety ?), cell body 34 μm long, 29 μm wide, constriction (isthmus) 28 μm wide, x 400, x 640, Uruguay, November 1999, photo by Yuuji Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Cosmarium connatum Cosmarium connatum

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