2o6 ZYGNEMATACEAE 



United States: Iowa and Missouri eastward to New Jersey. 



Europe; Australia; China. 



This includes the variant described by Czurda (1930) as S. grevilleana 

 (Hassall) Czurda. 



211. Spirogyra chuniae Jao 1935. Sinensia. 6, p. 609, PI. 10, 



Fig. 105. 



Vegetative ceils 28-39/1 x 67-130/^, with replicate end walls; i chro- 

 matophore, in some cells 2, making 2 to 5.5 turns in the cell; fertile cells 

 inflated; reaching a diameter of 8oiu.; conjugation scalariform; tubes 

 very short, sometimes formed only by the male gametangia; zygospores 

 ellipsoid with pointed ends, S5~43/^ ^ 70-1 19 a*,; median spore wall yel- 

 low, smooth. (PI. XXXVI, Fig. i.) 



China, Chungking. 



212. Spirog\tia incrassata Czurda 1930. Beih. Bot. Zentralbl. 



47, p. 38, Fig. 10. 



Vegetative cells 26-30 /j. x 200-250 /x, with replicate end walls; (i-) 

 2 chromatophores; conjugation lateral and scalariform; tubes formed 

 by both cells; fertile cells greatly inflated toward the middle; zygo- 

 spores ellipsoid, 42-52 /t x no/'.; median spore wall yellow-brown, irreg- 

 ularly punctate, and inwardly channeled. (PI. XXXVI, Figs. 2-4.) 



Germany, Berlin. 



213. Spirogyra rugosa (Transeau) Czurda 1932. Siisswasserflora 



Mitteleuropa. 9, p. 156. Amer. Jour. Bot. 1, p. 291. 19 14. 

 Phycoth. Bor.-Amer., No. 456 (as S. tenuissima var. 

 rugosa). 



Vegetative cells 10-13/A x 50-210/1, with replicate end walls; i chro- 

 matophore, making 2 to 6 turns; conjugation lateral and scalariform; 

 tubes formed by both gametangia; fertile cells greatly inflated toward 

 the middle; zygospores ellipsoid, 28-32/1 x 55-66 /t; median spore wall 

 yellow-brown, minutely scrobiculate. 



United States: Iowa; Illinois; Massachusetts; Rhode Island; New Jersey. 



214. Spirogyra foveolata (Skuja) Czurda 1932. Siisswasserflora 



Mitteleuropa. 9, p. 157. Skuja. Acta Horti Bot. Univ. 

 Latviensis. 3, p. 107. 1928. Not S. inftata var. foveolata 

 Transeau 1914 (see No. 216). 



Vegetative cells 11-16/A x 90-250/1, with replicate end walls; i chro- 

 matophore, making 3 to 10 turns in the cell; conjugation usually lateral, 

 sometimes scalariform, with the tubes formed mostly by the male gam- 

 etangia; fertile gametangia inflated to 30-45/1 toward the middle; zygo- 



