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Trebouxiophyceae (Pleurastrophyceae): Pleurastrales
(Chlorophyceae: Chaetophorales: Chaetophoraceae)

 Microthamnion strictissimum
Rabenhorst

Microthamnion Genus: Thalli branched uniseriate filamentous; attached by a basal cell with a small holdfast; cells cylindrical or sometimes subclavate; terminal cells with bluntly rounded end; chloroplasts a single, parietal plate-like; without pyrenoids (Photomicrog. Fresh-w. Alg. 4, 1985).
Species:

Microthamnion sp. ?, cell body μm long, μm wide, L/W=, x 640, used waterfield near Karakemi marsh (Yasaka village), Matsuzaki, Omachi city, Nagano Pref., Japan, April 24, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Microthamnion Microthamnion

Microthamnion strictissimum Rabenhorst: Vegetative cells short 15-25 μm long, 3 μm diam., axis clear (Illustrations of The Japanese Fresh-water Algae, 1977).

Microthamnion kuetzingianum NŠgeli: Vegetative cells short 10-20 μm long, 3 μm diam., axis unclear (Illustrations of The Japanese Fresh-water Algae, 1977).

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