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Gamophyceae: Zygnematales: Zygnemataceae

 Zygnema pectinatum
(Vaucher) Agardh

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 25-120 μm long, 30-36 μm wide; conjugation scalariform; zygotes formed within the tube, spherical or broad ellipsoidal, 40-54 μm long, 35-44 μm wide; surface layer yellowish brown, covered with small pores (2-3 μm φ) (Illustrations of The Japanese Fresh-water Algae, 1977).

Zygnema pectinatum (Vaucher) Agardh, cell body 40-60 μm long, 35 μm wide, x 200, x 400, x 640, rice field, Omiya-showa (near Arakawa cycling road), Saitama city, Saitama Pref., Japan, January 9, 2005 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
Zygote 52 μm long, 38 μm wide, x 400, x 640
Zygnema Zygnema Zygnema Zygnema
x 400, x 640
Zygnema Zygnema

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

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