SPIROGYRA 165 



ellipsoid, ^P-^^i^ x 50-65 ft; median spore wall yellow, irregularly and 

 coarsely punctate. (PI. XXIV, Fig. 13.) 



United States: Kentucky (Mclnteer Coll.). 



South America, Paraguay; South Africa. 



54. Spirogyra robusta (Nygaard) Czurda 1932. Trans. Roy. Soc. 



S. Africa. 20, Pt. II. Siisswasserfiora Mitteleuropa. 9, 

 p. 187. 

 Vegetative cells 29-35 /a i^ diameter, with plane end walls; i chro- 

 matophore; conjugation scalariform; tubes formed by both cells; fertile 

 cells inflated, 43-65 a*, in diameter; zygospores ellipsoid, 32-60 /x x 

 54-104 /i; median spore wall yellowish-brown, with faint, irregular 

 scrobiculations. (PI. XXIV, Figs. 14-15.) 

 South Africa. 



55. Spirogyra subpapulata Jao 1935. Sinensia. 6, p. 597, PL 7, 



Figs. 74-75. 



Vegetative cells 22-26 ^ x 41-166 /x, with plane end walls; i chro- 

 matophore, making 2-7 turns in the cell; reproduction by either zygo- 

 spores or aplanospores; conjugation scalariform; tubes formed by both 

 cells; sterile cells usually swollen to 58 yn in diameter; zygospores ellip- 

 soid, with pointed ends, 21-29 ja x 41-60^1; aplanospores subglobose or 

 ellipsoid, 22-26 /^ x 32-48 /x; median wall finely and densely punctate, 

 yellow at maturity. (PI. XXV, Figs. 1-2.) 



China, Szechwan, December, 1933, and January, 1934 (Jao Coll.). 



This species resembles Spirogyra papulata Jao, but has smaller vege- 

 tative cells and punctate spores. 



56. Spirogyra papulata Jao 1935. Sinensia. 6, p. 598, PL 7, Figs, 



76-78. 



Vegetative cells 28-32 /x x 64-176)0,, with plane end walls; chro- 

 matophore single, containing large pyrenoids; conjugation scalariform; 

 tubes formed by both gametangia; fertile cells usually shortened and 

 inflated on the conjugating side, up to 55 /x in diameter; sterile cells 

 sometimes swollen to 64^^; zygospores ellipsoid, very rarely subglobose, 

 22-32 /x x 35-55 ^t; median spore wall irregularly reticulate, golden yel- 

 low at maturity. (PI. XXV, Figs. 3-5.) 



China, Szechwan, January, 1933. 



57. Spirogyra scrobiculata (Stockmayer) Czurda 1932. Siiss- 



wasserfiora Mitteleuropa. 9, p. 182. 

 Vegetative cells 30-40 /a x 30-90 /a, with plane end wails; i chro- 

 matophore; conjugation scalariform; tubes formed by both gametangia; 

 fertile cells inflated on the conjugating side; zygospores ellipsoid. 



