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Xanthophyceae: Tribonematales:

Tribonema viride
Pascher

Tribonema Genus: Filament without branching; cell body cylindrical; each cell wall consists of two parts with "H" structure overlapping at the midregion; chloroplasts many, disc-shaped, without pyrenoids (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species: Filament 10-12-(-15) μm wide (Süßwasserflora von Mitteleuropa 3, Xanthophyceae 1, 1978). Filament 8-12 μm wide; many chloroplasts in each cell (Illustrations of The Japanese Fresh-water Algae, 1977).

Tribonema viride Pascher, cell body 18-20 μm long, 8-10 μm wide, L/W=2.3, x 640, Kiyasse-Hanyu (Mitagaya Agriculture Park), Mitagaya, Hanyu city, Saitama Pref., Japan, March 4, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tribonema viride Tribonema viride

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