SPIROGYRA 205 



United States: Iowa; Michigan; Kentucky; Indiana; Ohio; New Hamp- 

 shire; Massachusetts. 



China, several provinces (Li Coll. and Jao Coll.). 



Named for W. G. Farlow, Harvard University, founder of the Farlow 

 Herbarium and Library. 



207. Spirogyra weberi KiJtzing 1843. Phycologia Generalis, p. 279. 

 Vegetative cells 19-30 /a x 80-4801"., with replicate end walls; i chro- 



matophore, making 3 to 6.5 turns; fertile cells usually slightly enlarged; 

 conjugation scalariform; tubes formed by both cells; zygospores ovoid 

 to cylindric-ovoid, 21-30 ^ x 30-96 /x; median spore wall yellow, smooth; 

 aplanospores similar. (PI. XXXV, Fig. 14.) 



United States: Generally distributed in the eastern half, but not com- 

 mon; also in Colorado. 



Widely distributed in Europe, China, Java. 



Found hybridizing with S. tenuissima at Belding, Michigan (Ackley 

 Coll.). 



208. Spirogyra semiornata Jao 1935. Sinensia. 6, p. 604, PL 9, 



Figs. 97-98. 



Vegetative cells 27-32 /a x 96-245 /a, with replicate end walls; i chro- 

 matophore, making 2 to 6 turns in the cell; reproduction usually by 

 zygospores, rarely by aplanospores; conjugation lateral and scalariform; 

 tubes formed by both gametangia; fertile cells enlarged; zygospores 

 ovoid, 35-46/u. X 6i-io6/i; aplanospores subglobose to ovoid, 32-38/1 

 X S5-51M; median spore wall yellow-brown, smooth. (PI. XXXV, Figs. 

 15-16.) 



China, Szechwan, November to January. 



209. Spirogyra nyctigama Transeau 1938. Amer. Jour. Bot. 25, 



p. 525, Fig. II. 



Vegetative cells 34-38 /a x 72-180/1, with replicate end walls; i chro- 

 matophore, making 2 to 5 turns; conjugation scalariform; tubes formed 

 by both gametangia; receptive gametangia inflated to 65/1; zygospores 

 ellipsoid, 47-54/1 x 80-98 /a; median wall yellow-brown, smooth. (PI. 

 XXXV, Fig. 18.) 



South Africa, Cape Town (Stephens Coll.). 



210. Spirogyra grevilleana (Hassall) Kiitzing 1849. Species Al- 



garum, p. 438. 

 Vegetative cells 22-33 i^ ^ 60-325 /i, with replicate end walls ; i chro- 

 matophore, in some cells 2, making 4 to 9 turns; conjugation scalar- 

 iform and lateral; tubes formed largely by the male gametangia; fertile 

 cells fusiform-inflated to 36-43/1; zygospores ovoid, 30-:57/i x 60-90/1; 

 median spore wall yellow, smooth. (PI. XXXV, Figs. 19-20.) 



