190 ZYGNEMATACEAE 



154. Spirogyra sinensis Li 1933. Ohio Jour. Set. 33, p. 153, PI, i, 



Figs. 7-8. 



Vegetative cells 22-24/i. x 115-136/J., with plane end walls; 2 to 4 

 chromatophores, making 2.5 to 4.5 turns; conjugation scalariform; 

 tubes formed by both gametangia; fertile cells inflated toward the mid- 

 dle to about 50/t; zygospores lenticular, 3^-45/' in diameter; median 

 spore wall smooth, brown. (PL XXXI, Fig. 10.) 



China, Hangchow. 



155. Spirogyra frankliniana Tiffany 1934. Trajis. Amer. Micros. 



Soc. 53, p. 225. Ohio Jour. Sci. 24, p. 65. 



Vegetative cells 32-36 /x x 80-120/1, with plane end walls; 3 to 4 

 chromatophores, making i to 3 turns in the cell; conjugation scalar- 

 iform; tubes formed by both gametangia; fertile cells inflated toward 

 the middle; zygospores lenticular, 40-56/J. in diameter; median spore 

 wall smooth, brown. 



United States: Ohio, Franklin County, Baumgartner's Lake. 



156. Spirogyra pellucida (Hassall) Kiitzing 1849. Species Al- 



garum, p. 439. Hassall. History of British Freshwater 

 Algae, p. 143, Pi. 25, Figs. 1-2. 

 Vegetative cells 40-50 ju. x 100-400111, with plane end walls; 3 to 4 

 chromatophores, straight, or making .5 to 4 turns; conjugation scalar- 

 iform; tubes formed by both gametangia; i^ertile cells inflated toward 

 the middle; zygospores lenticular, 77-86 /x in diameter; median spore 

 wall smooth, brown. (PI. XXXI, Fig. 8.) 

 United States: Iowa (Prescott Coll.), 

 England; Finland; China. 



157. Spirogyra colligata Hodgetts 1920. Ann. Bot. 34, p. 523, 



PI. 22. 



Vegetative cells 29-40/1 x 240-640/1, with conspicuous collars be- 

 tween the cells; 4 to 6 chromatophores, usually 5, making .5 to 2.0 turns 

 in the cell; conjugation scalariform, lateral, and terminal; tubes formed 

 by both gametangia; fertile cells inflated at the middle up to 90-100/1; 

 zygospores lenticular to lenticular-globose, 50-80 ( -90 ) /i in diameter; 

 median spore wall verruculose, brown. (PI. XXXI, Figs. 11-13.) 



United States: Indiana, Laporte County (Britten Coll.), May 13, 1939. 



England. 



158. Spirogyra majuscula Kiitzing 1849. Species Algarum, p. 441. 

 Vegetative cells 50-80/1 x 80-500/1, with plane end walls; (3-) 5 to 



8 chromatophores, straight or making .3 turn; conjugation scalariform 

 and lateral; tubes formed by both gametangia; fertile cells shortened. 



