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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 32 μm long, 10.5 μm wide, x 640, an agricultural ditch near Fuki Golf Club, Maegochi, Yoshimi town, Saitama Pref., Japan, March 25, 2006 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tribonema regulare
Cell body 17-23 μm long, 7 μm wide,
x 640, an agricultural ditch near Fuki Golf Club, Maegochi, Yoshimi town, Saitama Pref., Japan, March 25, 2006 by Y. Tsukii
Tribonema regulare Tribonema regulare

Images of collecting locality: An agricultural ditch near Fuki Golf Club, Maegochi, Yoshimi town, Saitama Pref., Japan, March 25, 2006 by Y. Tsukii

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