(438) 



ruptured epider 

 2-5-celled, lin 

 slightly cons 

 brown, thin, : 



not noticeable; teliospores 



lear-oblong, 19-30 X 35-87 n, 



icted at the septa, wall pale 



; pedicels cylindric, often large, 



7-25^1 in diam.; pores 2, except in upper cell, 



For the aecia: Amelanchier alnifolia Nutt., 

 A. florida Lindl., A. pallida Greene, Cra- 

 taegus Douglasii Lindl. (C. brevispina 

 Dough), C. rivularis Nutt., iPourthiaea 

 villosa (Thunb.) Dec. (Photinia villosa 

 DC). 



For the telia: Heyderia decurrens (Torr.) 



K. Koch. (Libocedrus decurrens Torr.). 



: Shasta Springs, Siskiyou Co., Calif., on Cratae- 



Distribution: Pacific slope of the United States from Oregon 

 southward into northern California; possibly also in Japan 

 (Aecidium Pourthiaeae Sydow). 



Exsiccati: Sydow, Ured. 1149, 1786; Ellis & Ev., N. Am. Fungi 



2. Gymnosporangium Sorbi (Arth.) 

 Wredo nootkatensis Trel. Harriman Alaska Exped. 5: 36. 

 Aecidium Sorbi Arth. Bull. Torrey Club 33: 521. 1906. 



Aecia hypophyllous, in small groups of 4-7 on discolored t 

 ened spots, or often n 

 swellings o 

 0.4 mm. 

 colorless, 



wall thick, 



inner and side walls thinner, 

 dly ellipsoid ; 

 wall pale yellow, thick, 3-4/u, 



*This 





t-figur 



