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Gamophyceae: Desmidales: Desmidiaceae
(Charophyceae: Zygnematales: Desmidiaceae)

Onychonema filiformis
(Ehrenberg) Roy et Bisset

Onychonema Genus: Cell body flat, constricted at the center; semicell with 2 or 4 thick spiny projections; cells attached with each other at the center of their apex forming a filament, spiny projections extending over the adjoining cell.
Species: Filaments twisted; cell body 11-12.6 μm long, 11-14 μm wide, constriction 3-5.6 μm wide; semicells ellipsoidal or reniform; apex flat, from both corners two long projections arising to connect with adjoining cell (Illustrations of The Japanese Fresh-water Algae, 1977).

Onychonema filiformis, cell body 12 μm long (semicell 6 μm long), 9 μm wide, x 400, x 640, Vermont-Maine U.S.A., August 7-13, 1999, by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Onychonema Onychonema

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