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Xanthophyceae: Tribonematales:

Tribonema
Derbès et Solier

Family: Filamentous algae without branching; cell body cylindrical or fusiform swelled at the center; a single or many chloroplasts plate-like or small disc-shaped (Illustrations of The Japanese Fresh-water Algae, 1977).
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).
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Cell body 6-12 μm wide
Tribonema
T. viride
13 samples
8-14 μm φ
many chl.
1999-2008
Tribonema
Tribonema sp.
11-12 μm φ
2-4 chl.
Shimo-muneoka
Shiki
Saitama, 2004
Tribonema
T. regulare
28 samples
6-9 μm φ
2-4 chl.
1999-2008
Tribonema vermichloris
T. vermichloris
5 samples
16-55 x 7-9 μm
2005-2008
Tribonema
Tribonema sp. ?
6 μm φ
Kiyose
Tokyo, 2001
xxxx
Tribonema sp. ?
6-6.5 μm φ
Motono
Chiba, 2003
Cell body less than 6 μm in width
Tribonema
T. minus
27 samples
4-7 μm φ
2 chloroplasts
2001-2008
Tribonema
T. minus ?
5 μm φ
chloroplasts
Usui river
Takasaki
Gunma, 2004
Tribonema
T. affine
7 samples
4.5-6 μm φ
2 chloroplasts
2004-2006
Tribonema
T. elegans
7 samples
x 3.5-5 μm φ
2003-2006

T. ambiguum ?
12-15 x 3.5 μm
Saitama, 1999
Tribonema
T. monochloron ?
x 2.5-3 μm
Lake Biwa
Maihara
Shiga, 2003
xxxx
Tribonema ?
or Oscillatoria ?
μm
Shishizuka
Tsuchiura
Ibaraki, 2003
xxxx
Tribonema sp. ?
μm
Kiyose
Tokyo, 2001
xxxx
Tribonema sp. ?
μm
Oura central p.
Oura
Gunma, 2006
Similar genera -->> Microspora;

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Tribonema
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