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SPIROGYRA 215
244. Spirogyra gratiana Transeau 1938, Amer. Jour. BoL 25,
p. 528, Figs. 12-13.
Vegetative cells 28-33 /x x 144-400 /a, with replicate end walls; usually
3 chromatophores (rarely in some cells 2 or ; 4) conjugation lateral and
scalariform ; tubes formed by both gametangia; receptive gametangia
cylindric or enlarged; zygospores ellipsoid, Ai 35-47 x 108-223 ju.; all walls
smooth; median wall yellow; aplanospores infrequent, smaller, 38-40^0.
X47-72A^. (PL XXXVIII, Figs. 8-^.)
Coll.).
United States: Minnesota, Grand Marais, June 17, 10^6 (Grace Nichols
The filaments are remarkable in that they are almost perfecdy straight
during and after conjugation.
245. Spirogyra proavita Langer 1913. Boi. KdzlemenyeJ^. 12,
p. 166.
Vegetative cells 37-40 jU, x fi, 330-560 with replicate end walls; 2-3
chromatophores, making i to 3.5 turns in the cell; conjugation lateral;
tubes arising from primordia several microns away from the end wall,
thus forming a distinct tube outside the filament; fertile cells cylindric;
zygospores ovoid, 38-40 /x x 82-86 ju.; median spore wall smooth, brown-
ish-yellow when mature. (PI. XXXVIII, Fig. 7.)
Hungary.
This species resembles Number 243, S. hartigii, in important partic-
ulars and perhaps is a somewhat smaller variant; differs from Number 264,
S. crassispina, in having ovoid spores.
246. Spirogyra transeauiana Jao 1935. Sinensia. 6, p. 610, PI. 10,
Fig. 107.
Vegetative cells 42-61 /i. x 160-304;^, with repHcate end walls; 2 to 3
chromatophores, making 2 to 5 turns; conjugation scalariform; tubes
formed by both gametangia; fertile cells cylindric or slightly enlarged
on the conjugating side; zygospores ellipsoid with rounded ends,
41-58 /x x 96-183/U.; median spore wall yellow, smooth. (PI. XXXVIII,
Fig. 10.)
China, Szechwan.
247. Spirogyra rectangularis Transeau 1914. Amer. Jour. BoL
1, p. 291, PI. 25, Figs. 9-11.
Vegetative cells 35-40 /i x 1 50-320 /x, with repHcate end walls; 2 to 4
chromatophores, making 2 to 5 turns; conjugation lateral and scalar-
iform; tubes formed by both gametangia; fertile cells cylindrically in-
flated to 48-70^; zygospores ovoid to cylindric-ovoid, 45-65 /x x 75-120 /j.;
median spore wall yellow-brown, smooth. (PI. XXXVIII, Figs. 11-12.)