SPIROGYRA 183 



PI. 8, Figs. 87-88. Amer. Jour. Bot. 23, p. 58, Figs. 25-26. 

 1936. 



Vegetative cells 38-581". x 112-256^1., with plane end walls; 3 to 4 

 chromatophores, making i to 3.5 turns; conjugation scalariform; tubes 

 formed by both gametangia; fertile cells cyHndric; zygospores ellipsoid 

 to cylindric-ellipsoid, with more or less rounded ends, 43-54 ;"■ x 64-102^1; 

 median spore wall of 2 layers; outer, brown and densely wrinkled; 

 inner, brown, finely punctate, and at times finely and irregularly retic- 

 ulate. (PI. XXIX, Figs. 11-13.) 



United States: Florida; Tennessee; Texas. 



Puerto Rico; Brazil; China, Szechwan. 



127. Spirogyra rhizobrachialis Jao 1935. Sinensia. 6, p. 599, 



PI. 7, Figs. 81-83. Amer. Jour. Bot. 23, p. 57, Figs. 18-21. 

 1936. 



Vegetative cells 40-45 /a x i 14-240 /x, with plane end walls; 3 to 5 

 chromatophores, making 1.5 to 2.5 turns; in some portions of the fila- 

 ment each sterile cell produces a lateral rhizoid-shaped attachment with 

 a more or less lobed hapteron; conjugation scalariform; tubes formed 

 by both gametangia; fertile cells cylindric, sometimes shortened and en- 

 larged; zygospores ellipsoid with more or less rounded ends, 38-60/^ x 

 58-100 ju.; median spore wall yellow-brown, finely and irregularly retic- 

 ulate. (PI. XXIX, Figs. 14-16.) 



United States: Wisconsin (Prescott Coll.). 



China, Chungking, February, 1930. 



128. Spirogyra paraguayensis Borge 1903. ArJ{. Bot. 1, p. 280. 

 Vegetative cells 41-45;". x 80-200 ;U., with plane end walls; 3 to 4 



chromatophores, nearly straight, or making .5 turn; conjugation 

 scalariform; tubes formed by both gametangia; fertile cells cylindric, 

 shortened; zygospores ellipsoid, 37-42 fi x 58-65/^; median spore wall 

 irregularly corrugate, yellow-brown. (PL XXIX, Figs. 17-18.) 

 South America, Paraguay. 



129. Spirogyra subreticulata Fritsch 1921. Trans. Roy. Soc. S. 



Africa. 9, p. 48. 



Vegetative cells 50-54 /-<. x 150-400 /a, with plane end walls; 3 to 4 

 chromatophores, making .5 to 3 turns; conjugation scalariform; tubes 

 formed by both gametangia; fertile cells cylindric or enlarged; zygo- 

 spores ellipsoid to somewhat ovoid, 42-54 /a x 60-124 /x; outer median 

 spore wall irregularly reticulate, yellow-brown; inner wall brown, up 

 to 9/x thick. (PI. XXIX, Figs. 19-21.) 



United States: Iowa; Indiana. 



South Africa; China, Shantung (Li Coll.). 



