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SPIROGYRA 205<br />
United States: Iowa; Michigan; Kentucky; Indiana; Ohio; New Hampshire;<br />
Massachusetts.<br />
China, several provinces (Li Coll. and Jao Coll.).<br />
Named for W. G. Farlow, Harvard University, founder of the Farlow<br />
Herbarium and Library.<br />
207. Spirogyra weberi KiJtzing 1843. Phycologia Generalis, p. 279.<br />
Vegetative cells 19-30 /a x 80-4801"., with replicate end walls; i chromatophore,<br />
making 3 to 6.5 turns; fertile cells usually slightly enlarged;<br />
conjugation scalariform; tubes formed by both cells; zygospores ovoid<br />
to cylindric-ovoid, 21-30 ^ x 30-96 /x; median spore wall yellow, smooth;<br />
aplanospores similar. (PI. XXXV, Fig. 14.)<br />
United States: Generally distributed in the eastern half, but not common;<br />
also in Colorado.<br />
Widely distributed in Europe, China, Java.<br />
Found hybridizing with S. tenuissima at Belding, Michigan (Ackley<br />
Coll.).<br />
208. Spirogyra semiornata Jao 1935. Sinensia. 6, p. 604, PL 9,<br />
Figs. 97-98.<br />
Vegetative cells 27-32 /a x 96-245 /a, with replicate end walls; i chromatophore,<br />
making 2 to 6 turns in the cell; reproduction usually by<br />
zygospores, rarely by aplanospores; conjugation lateral and scalariform;<br />
tubes formed by both gametangia; fertile cells enlarged; zygospores<br />
ovoid, 35-46/u. X 6i-io6/i; aplanospores subglobose to ovoid, 32-38/1<br />
X S5-51M; median spore wall yellow-brown, smooth. (PI. XXXV, Figs.<br />
15-16.)<br />
China, Szechwan, November to January.<br />
209. Spirogyra nyctigama Transeau 1938. Amer. Jour. Bot. 25,<br />
p. 525, Fig. II.<br />
Vegetative cells 34-38 /a x 72-180/1, with replicate end walls; i chromatophore,<br />
making 2 to 5 turns; conjugation scalariform; tubes formed<br />
by both gametangia; receptive gametangia inflated to 65/1; zygospores<br />
ellipsoid, 47-54/1 x 80-98 /a; median wall yellow-brown, smooth. (PI.<br />
XXXV, Fig. 18.)<br />
South Africa, Cape Town (Stephens Coll.).<br />
210. Spirogyra grevilleana (Hassall) Kiitzing 1849. Species Algarum,<br />
p. 438.<br />
Vegetative cells 22-33 i^ ^ 60-325 /i, with replicate end walls ; i chro-<br />
matophore, in some cells 2, making 4 to 9 turns; conjugation scalar-<br />
iform and lateral; tubes formed largely by the male gametangia; fertile<br />
cells fusiform-inflated to 36-43/1; zygospores ovoid, 30-:57/i x 60-90/1;<br />
median spore wall yellow, smooth. (PI. XXXV, Figs. 19-20.)