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Gamophyceae: Zygnematales: Zygnemataceae

 Zygnema sp.

Zygnema Genus: Filament without branching; cell body cylindrical; two chloroplasts star-shaped; tubes formed (or cell body fused) at conjugation; zygospore spherical or broad ellipsoidal formed within female gametangium (Guide book to the "Photomicrographs of the Freshwater Algae", 1998).
Species:

Zygnema sp., cell body 44 μm long, 23 μm wide, L/W=1.9, x 640, Southern lakeside of Lake Shirakaba, Tateshina town & Chino city, Nagano Pref., Japan, May 21, 2005 by Y. Tsukii
scale 31 μm scale 63 μm scale 94 μm; x 640
Zygnema Zygnema
Elongeted cell body (or other species ?) 108 μm long, 20 μm wide, L/W=5.4, x 640
Zygnema

Zygnema excompressum Transeau: vegetative cells 32-80 μm long, 23-26 μm diam., 2 chloroplasts in each cell

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