320 



Mycologia 



tered uredinia and telia, uredinia with thick-walled (1.5-3 /*)> 

 peripheral paraphyses (fig. 4), and narrow teliospores, 15-21 by 

 45-55 /x. In these characters of the uredinia and telia, therefore, 

 Puccinia Koeleriae shows a number of important differences from 



Fig. 4. Teliospores, urediniospore and uredinial paraphyses from the 

 type specimen of P. Koeleriae (X 400). 



P. montanensis and must be considered as a distinct species, while 

 showing relationship in that both possess abundant paraphyses and 

 urediniospores with brown, thick walls and 8-10 scattered pores. 



Puccinia apocrypta 



A study was made of the rust used by Arthur (1. c. 4) in the 

 cultures of the Hydrophyllum aecia mentioned above, in order to 

 establish its identity. As the result of this study it was decided 

 that the rust in question probably was Puccinia apocrypta Ellis & 

 Tracy. This rust was described by Ellis & Tracy 6 from material col- 

 lected by Tracy at Canon City, Colo., Aug., 1887, on "Asprella Hys- 

 trix" which host determination Arthur 7 (p. 138) has shown prob- 

 ably was an error for Sitanion elymoides. An examination of this 

 material shows that Puccinia apocrypta is very distinct from both 

 P. montanensis and P. Koeleriae, being distinguished by its smaller, 

 paler urediniospores having fewer germ pores and by the absence 

 of paraphyses in the uredinium. Still further cultural evidence of 

 the aecial relationship of this rust was obtained when, in June, 



6 Ellis, J. B., and Tracy, S. M. A Few New Fungi. Journ. Mycol. 6: 

 76-77. 1890. 



7 Arthur, J. C. Cultures of Uredineae in 1915. Mycologia 8: 125-141. 

 1916. 



