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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: Cell body 30-73 μm long, 16-20 μm wide; conjugation tubes formed by both gametangial cells; fertile cells inflated on the conjugating side; zygospores spherical or nearly spherical, 36-46 μm in diam., 34-45 μm long; medial spore wall yellowish brown, with small pores 3-4 μm in diam. arranging at 2.5-4 μm intervals at maturity (Illustrations of The Japanese Fresh-water Algae, 1977).

Zygnema normani Taft (or Z. calosporum Jao ?), cell body 37-75 μm long, 26 μm wide, x 400, x 640, rice field, Kamishiro, Hakuba village, Nagano Pref., Japan, October 3, 2004 by Y. Tsukii
scale 50 μm scale 100 μm scale 150 μm; x 400 : scale 31 μm scale 63 μm scale 94 μm; x 640
Zygnema Zygnema Zygnema Zygnema Zygnema

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

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