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210 ZYGNEMATACEAE
formed by the male gametangia; fertile cells cylindrically inflated toward
the middle; zygospores ovoid, 35-3^/^- x 45-48/1; median spore
wall double, of which the outer layer is thick, smooth, and yellow; the
inner, coarsely areolate, yellow-brown at maturity. (PI. XXXVII,
Fig- 1 3-)
China, Szechwan, December 27, 1933.
See also Number 262.
226. Spirogyra spreeiana Rabcnhorst 1863. Die Algen Sachsens,
No. 988.
Vegetative cells 18-24/1 x 140-600/1, with replicate end walls; i
chromatophore, making 1.5 to 4 turns; conjugation scalariform and
lateral; tubes formed mostly by the male gametangia; fertile cells not
shortened, enlarged and inflated toward the middle to 30-42/1; zygo-
spores and aplanospores ellipsoid, 30-36/1 x 55-100/'.; median spore wall
yellow, smooth. (PL XXXVII, Figs. 4-6.)
United States: Texas; Iowa; Michigan; Tennessee; eastward to Massachusetts;
Washington.
Europe, Germany to Finland and Rumania; South Africa.
Original collection by Th. Spree near Boekhorst, Holland, in 1S60.
Czurda gives diameter of vegetative cells as i6-i8/