Host plants: 



For the aecia: Crataegus Douglasii Lindl. (C. brevispina 

 DougL), C. Williamsii Eggl. 



For the telia: unknown. 

 Type locality: Near Flathead Lake, Montana, on Crataegus 



nox: Known only from western Montana. 



i {Roestelia) Botryapites Schw. Trans. Am. Phil. Soc. II. 4: 

 1832. 



ts (Caeoma) Botryapites Schw. Trans. Am. Phil. Soc. II. 4: 

 1832. 



sporangium biseptatumEWis, Bull. Torrey Club 5: 46. 1874. 



ia Ellisii Peck, Bull. Torrey Club 6: 13. 1875. 



ia Botryapites Cooke & Ellis, Grev. 5: 34. 1876. 



ia Botryapites Kuntze, Rev. Gen. PL 3: 508. 1898. 



la Botryapites Arth. Proc. Ind. Acad. Sci. 1900: 135. 1901. 



1 hypophyllous, usually in groups of 2-8, rarely solitary, 

 borne in gall-like pyriform protuberances 1— 1.5 

 mm. in diameter by 1. 5-3 mm. high, cylindric, 

 0.5-0.8 mm. in diameter by 2-4 mm. high; perid- 

 ium soon becoming finely cancellate, not dehis- 

 cent at apex; peridial cells cylindric, hyphal-like, 

 9-14^ in diameter by 145-190^ long, often irregu- 

 larly bent, outer, inner, and side walls of equal 

 thickness, about 1.5-2^, whole surface smooth; 

 aeciospores globoid, small, 15-17X16-22^, wall 

 dark cinnamon-brown, rather thick, 2.5-3/i, mode- 

 Telia caulicolous, appearing on fusiform swell- 



ings, s 



;de by 2-7 



.valo 





long, often confluent, her 



n; teliospores 2-4 celled, 



3-19X35-77M, usually rounded above, somewhat 



r ed below, slightly constricted at the septa, 



yellow, 1-1.5/i thick, pores 2 in each cell, 





•the s 



:pta. 



For the aecia: Amelanchier canadensis (L.) 

 Medic. {Amelanchier Botryapium DC), A. 

 media Spach. 



