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Xanthophyceae: Tribonematales:

Tribonema regulare
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).
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 23-27 μm long, 8-9 μm wide, x 640, Riverside green land (near Tone river), Sawara city, Chiba Pref., Japan, October 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tribonema regulare Tribonema regulare Tribonema regulare Tribonema regulare Tribonema regulare

Tribonema subtilissimum Pascher: Filament 2-3 μm wide; cell body 4-8 times longer than its width; many disc-shaped chloroplasts (Süßwasserflora von Mitteleuropa 3, Xanthophyceae 1, 1978).

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