AMERICAN UREDINE.E. 30! 



echinulate; pores 4-6, scattered, lateral; pedicel sub-persistent, 

 hyaline, usually about the length of the spore, but sometimes 

 75-100 11. 



III. Teleutospores (intermixed with the uredospores) 

 brownish yellow, oblong or obovate, smooth, 30-37x16-20", 

 much constricted at the middle: apex thickened, rounded or 

 obtusely pointed; base rounded, sometimes narrowed; pedicel 

 slightly tinted, delicate, usually not exceeding the length of 

 the spore, but sometimes much longer. 



On Stifa viridula Trim Hot Springs. N. M., E. W. D. 

 Holway, Sept. 13, 1896; Valley City, N. D., A. B. Seymour. 

 Aug. 25, 1884; Fort Collins, Colo.. C. F. Baker. March, 1894 

 and March, 1896. C. S. Crandall. 1898. 



The specimens gathered at the three widely separated sta- 

 tions show no evident differences. Teleutospores, not abund- 

 ant, and even entirely wanting in part of the Colorado collec- 

 tions, are much like those of Puccinia stipcc. but smaller. No 

 exclusive teleutosori were seen. The very remarkable uredo- 

 spores have considerable resemblance to teleutospores, and 

 among them in each collection can be found a few uredospores 

 of a more common type, but which show all gradations to the 

 form characteristic of the species. The pores are readily seen 

 in most cases without treatment. 



The same host is said by Seymour (List of fungi collected 

 in 1884 along the N. Pac. railroad. Proc. Boston Soc. Nat. 

 Hist. 24:188) to bear Puccinia stificc. but examination of the 

 original matt-rial, rive packets, kindly loaned by Mr. Seymour, 

 shows that the host in all the collections, which was doubt- 

 fully referred at the time to Stifa viridula (misprinted S. 

 viridis), is really S. comata. and that the rust is the true P. 

 stipcv as stated in the published list. The specimen cited 

 above, which was collected by Mr. Seymour upon the same 

 journey, is not referred to by him in his list. It consists of 

 four fragments of leaves from 5 to 8 cm. long, and some of 

 the inflorescence. It has been for some years, and is still in 

 the Arthur herbarium. 



