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Xanthophyceae: Tribonematales:

Tribonema sp.
(Wille) Hazen

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:

Tribonema sp., cell body μm long, 5 μm wide, x 640, Usui river, near Yachiyo bridge, Takasaki city, Gunma Pref., Japan, April 11, 2004 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Tribonema minus Tribonema minus Tribonema minus Tribonema minus Tribonema minus

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