1902] 



THE UREDINEM IN AMERICA 



5 



also extends somewhat to the uredospores, which generally are 

 larger and have thicker walls. But these characteristics are not 

 wholly absent from inland specimens. They are quite as well 

 shown in both sori and spores in two collections from Alberta 

 and North Dakota in the northwest, both on Spariina gracilis 

 \fig' ly ^), and also, so far as the spores are concerned, in a speci- 

 men from Nebraska (Bates, Aug. 1 899) and one from Wiscon- 

 sin (Davis, Oct. 1888), both on S. cynosiiroides [Jig. /, b and d). 

 The latter specimen is in the herbarium of Mr. A. B. Seymour, 



e 



b 



d 



Fig. I. — U. acuminaius : ^z, three teleutospores showing size and diverse forms 

 common on the western prairies, on Spartina cynosziroides from Iowa; b, two teleuto- 

 spores on same host from Wisconsin (Davis, 1888); r, three uredospores and three 

 teleutospores of the typical U, Spariinac Farl. common along the seashore, on Spartina 

 glabra from Woods Hole, Mass.; d, one uredospore and one teleutospore on Spartina 

 cynosuroides from Nebraska (Bates, Aug. 1899); e^ two uredospores and three teleu- 

 tospores on Spartina gracilis from Alberta (Holway, 1901). 



and is accompanied by the following note, probably made by 

 the collector: *' Has the large, blunt-warted uredospores of 



Sp. 



long and broad pedicels of the 



teleutospores. nor the large, elongated sori ; it has darker and 

 more rounded teleutospores than Urom. acumifiatusJ' This note 

 brings out clearly the distinctions that have been maintained 

 between the two forms. 



Of the variability of the teleutospores of the inland form 

 Burriin makes the following observations [fig^r.a): '* Among 



^ Parasitic fungi of Illinois, Bull. 111. Lab. Nat. Hist. 2 : 169. 



