210 ZYGNEMATACEAE 



formed by the male gametangia; fertile cells cylindrically inflated to- 

 ward the middle; zygospores ovoid, 35-3^/^- x 45-48/1; median spore 

 wall double, of which the outer layer is thick, smooth, and yellow; the 

 inner, coarsely areolate, yellow-brown at maturity. (PI. XXXVII, 



Fig- 1 3-) 



China, Szechwan, December 27, 1933. 

 See also Number 262. 



226. Spirogyra spreeiana Rabcnhorst 1863. Die Algen Sachsens, 



No. 988. 



Vegetative cells 18-24/1 x 140-600/1, with replicate end walls; i 

 chromatophore, making 1.5 to 4 turns; conjugation scalariform and 

 lateral; tubes formed mostly by the male gametangia; fertile cells not 

 shortened, enlarged and inflated toward the middle to 30-42/1; zygo- 

 spores and aplanospores ellipsoid, 30-36/1 x 55-100/'.; median spore wall 

 yellow, smooth. (PL XXXVII, Figs. 4-6.) 



United States: Texas; Iowa; Michigan; Tennessee; eastward to Massa- 

 chusetts; Washington. 



Europe, Germany to Finland and Rumania; South Africa. 



Original collection by Th. Spree near Boekhorst, Holland, in 1S60. 

 Czurda gives diameter of vegetative cells as i6-i8/<., which measurements 

 would exclude the original material. 



227. Spirogyra tsingtaoensis Li 1936. Bull. Fan Mem. Inst. Biol. 



7, p. 61, PI. I, Figs. 3-4. 

 Vegetative cells 20-25/1 x 54-80 /a, with replicate end walls; i chro- 

 matophore, making .5 to 2 turns in the cell; conjugation scalariform 

 and lateral; tubes formed by the male gametangia; fertile cells inflated 

 up to 35/1. and shortened; zygospores ellipsoid with rounded ends, 

 24-28/i. X 46-52/1; median spore wall smooth, yellow. (PI. XXXVIl, 



Fig. 7-) 



China, Tsingtao, May, 1935. 



228. Spirogyra arta Jao 1935. Sinensia. 6, p. 602, PI. 8, Fig. 93. 

 Vegetative cells i6-i8/i x 105-350/J^, with replicate end walls; i 



chromatophore, making 3-8 turns in the cell; conjugation scalariform; 

 tubes formed by both gametangia; fertile cells enlarged, rarely inflated; 

 zygospores ellipsoid to cylindric-ellipsoid, 22-26(-32) /t x 51-103/x; me- 

 dian spore wall yellow, smooth. (PI. XXXVIl, Fig. 8.) 

 China, Szechwan, December and January, 1933-34. 



229. Spirogyra tumida Jao 1935. Sinensia. 6, p. 602, Pi. 9, Fig. 96. 

 Vegetative cells 16-19/1 x 85-175/1, with replicate end walls; i chro- 

 matophore, making 3 to 9 turns in the cell; conjugation scalariform; 



