1902] 



THE UREDINE^ IN AMERICA 



13 





this information and the necessary material, but was frustrated 



by failure of the 



teleutospores to germinate. 



The preceding 



winter seems, for some unknown reason, to have been destructive 



of many plant rusts. 



Asp, 



lateripcs, P. emaculaia^ P. vexaiis, and many others could not be 

 made to germinate, showing that the spores had winter-killed. 

 Although cultures must be awaited, yet there can be little doubt 

 that the early stages of P. Seymotiriana occur upon Cephalanthus. 



U 



I 



k 





m 



Fig. 3. — P, Seymotiriana : -^, four uredospores, and (/) three teleutospores, on 

 Spartina cynosuroides, P. Distichlidis : w, five uredospores, the two lowermost shown 

 in transverse optical section, and («) four teleutospores, both on Spartina gracilis, 



4. PucciNiA Distichlidis E. & E. 1893. Proc. Phih Acad. Sci, 

 ^893: 152. 



Syn,: i8g8. Dicaeo7na Distichlidis Kuntze. Rev, Gen. PL 3: 468. 



O. I. Spermogonia and aecidia unknown. 



11, III. Sori epiphyllous, intercostal, early naked, ruptured 

 epidermis conspicuous. IL Uredospores broadly elliptical^ 

 broadly obovate or globose, 26-32 by 27-40/4, wall pale yellow, 

 thick, abundantly echinulate with stout points, pores six or more, 

 scattered, indistinct, contents sometimes centrally shrunken. 

 III. Teleutosori blackish, prominent, linear-lanceolate with acute 

 ends; teleutospores obovate or lance-oblong, 17-21 by 48-56/4, 



