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: Soil algae; "H" structure of the cell wall inconspicuous (Illustrations of The Japanese Fresh-water Algae, 1977).

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X. debile 8-24 x 3-4 μm Ceske Stredohori M. Czech Republic, 2001	X. solidum 6-20 x 5-7 μm Ceske Stredohori M. Czech Republic, 2001	X. solidum ? 22-30 x 11 μm Gyoda general p. Gyoda Saitama, 2006	X. solidum ? 11 x 10 μm Kitamoto nature o. p. Kitamoto Saitama, 2006
Xanthonema sp. 12.5-25 x 10 μm Akigase Park Saitama, 2002	Xanthonema sp. stock Sua-4 μm Akigase Park Saitama, 2002	Xanthonema sp. stock Sua-4 μm Akigase Park Saitama, 2002	X. debilis ? 4-7 x 5 μm Akigase Park Saitama, 2002
Xanthonema sp. 13 x 11 μm Ayame-en Ushiku Ibaraki, 2007

Similar genus ->> Tribonema;

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