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Xanthophyceae: Tribonematales:

Tribonema regulare
Pascher

Genus: 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 6-7 μm wide; cell body 2-3 times longer than its width; 2-4 parietal chloroplasts (Süßwasserflora von Mitteleuropa 3, Xanthophyceae 1, 1978).


Tribonema regulare Pascher ?, cell body μm long, 6-9 μm wide, x 640, Shimo-akaiwa, Matsubushi town, Saitama Pref., Japan, March 2003 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tribonema Tribonema


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