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Xanthophyceae: Tribonematales:

Tribonema regulare

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 10-20 μm long, 8 μm wide, L/W=, x 640, standing water, near Akaiyaji-shoya-shokubutu-gunraku (Akai wetland), Aizuwakamatsu city, Fukushima Pref., Japan, May 4, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tribonema regulare Tribonema regulare

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