Gamophyceae:
Zygnematales: Zygnemataceae
Zygnema sp.
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).
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Zygnema normani Taft (or Z. calosporum Jao ?),
cell body 30-60 μm long, 25.5 μm wide,
x 640, near Fukasaku-gawa Yusuichi, Saitama city, Saitama Pref., Japan, May 2002 by Y. Tsukii
50 μm
100 μm
150 μm; x 400 :
31 μm
63 μm
94 μm; x 640
Zygnema sp.,
cell body μm long, 25 μm wide,
x 640, x 400, x 640, near Fukasaku-gawa Yusuichi, Saitama city, Saitama Pref., Japan, May 2002 by Y. Tsukii
Zygnema excompressum Transeau:
vegetative cells 32-80 μm long,
23-26 μm diam.,
2 chloroplasts in each cell
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