SPIROGYRA 173 



This imperfectly described species of Wollny has been completed by 

 the additional data gleaned from Miss Stephens' collection. 



85. Spirogyra wrightiana Transeau 1938. Amer. ]our. Bot. 25, 



p. 527, Figs. 16-17. 



Vegetative cells 130-165/u, x 275-43o(-69o) ^i, with plane end walls; 

 6-8 chromatophores, making 1-3 turns in the cell; conjugation un- 

 known; aplanospores mostly ellipsoid, 100-126 /j. x 158-206 /a; sporangia 

 cyhndric and of the same dimensions as the vegetative cells; spore walls 

 in the material seen probably not mature, smooth and colorless. (PI. 

 I, Figs. 4-5; PI. XXVII, Figs. 7-8.) 



South America, Brazil, Parahiba, July 14, 1934 (Drouet Coll.). 



Very similar in appearance to the preceding species; and, as is usual in 

 aplanosporic species, the spores are small compared with the volume of the 

 vegetative cells in which they form. 



86. Spirogyra yunnanensis Li 1939. Bull. Fan Mem. Inst. Biol., 



Botany. 9, p. 224, PL 27, Fig. 2. 



Vegetative cells 98-1 10 /u. x 224-268 /x, with plane end walls; chro- 

 matophores 6-8, making 2-4 turns in the cell; conjugation scalar if or m; 

 tubes formed by both gametangia; fertile cells cylindric and shortened; 

 zygospores ellipsoid, 88-96 /^ x 120-180^; median spore wall smooth, 

 yellow. (PI. XXVII, Fig. 9.) 



China, Yiinnan. 



87. Spirogyra hatillensis Transeau 1936. Brittonia. 2, p. 171. 

 Vegetative cells 120-130111 x 108-450/4, with plane end walls; 6 to 8 



chromatophores, having .5 to 4 turns; conjugation scalariform; tubes 

 formed by both gametangia; fertile cells cylindric; sterile cells more or 

 less swollen; zygospores ellipsoid, 85-125/1 x 130-160/1; median spore 

 wall brown, smooth. Spores small compared with volume of gam- 

 etangium. (PI. XXVII, Fig. 10.) 



United States: North Carolina (Whitford Coll.). 



Puerto Rico, Hatillo, February, 191 5 (Wille Coll.). 



88. Spirogyra ellipsospora Transeau 1914. Amer. Jour. Bot. 1, 



p. 294. 



Vegetative cells 125-150/1 x 125-500 /t, with plane end walls; 3 to 8 

 chromatophores, making .4 to 5 turns; conjugation scalariform; tubes 

 formed by both gametangia; fertile cells cylindric; zygospores ellipsoid, 

 more or less pointed, 100-140 /x x 160-255/1; median spore wall smooth, 

 yellow-brown. (PI. XXVII, Fig. 11.) 



Generally distributed in the eastern half of the United States, but no 

 reports from the southern coastal plain. 

 Central China. 



