A new species of Puccinia 



R, E. Stone 



The genus Puccinia has so many species and so many of them 

 are so hard to determine that it seems almost an imposition to 

 describe a new species. However, in collecting, something is oc- 

 casionally found that can not be referred correctly to any known 

 species, 



"rusts" on plants o( the Cyperaceae most frequently 



The 



belong to the genus Puccinia, However, Rynchospora seems 

 to be an exception and the only " rust " I find listed for 



Figure i. /*. an^ustata Peck. II and III, X 260. 

 Notice the position and character of the germ -pores of the urediniospores. 



that genus belongs to the Uromyces type of the Uredineae. 

 For this reason, when I discovered on Ryyichospora corniciilata 

 (Lam.) A. Gray, a Puccinia^ I immediately began to tiy to find 

 some place for it among the species recorded on the various 

 Cyperaceae. After careful comparisons this species of Puccinia 

 was found to agree fairly well with Pnccinia angustata Peck but 

 differs from it sufficiently to warrant its description as a new 



species 



Puccinia angustatoides sp. nov. 



O et I. Incognatis. 



IL Urediniosoris hypophyllis, minutis, linearibus, 0.5-1 mm., 



549 



