Aug. 2 7, 1917 Puccinia graminis on Cereals and Grasses 



445 



Dactylis glomerata may be affected with either P. graminis avenae or 

 P. graminis phleipratensis in the field (Table XII). It will be noticed 

 that the grass collected at Ames, Iowa, was affected with P. graminis 

 phleipratensis. It is quite probable that both forms of rust may occur 

 on the same plants in the field, but both were not found. 



Table XIII. — Results of inoculations with urediniospores from Elymus brachystachys 



Scribn. and Ball. 



The rust on Elymus brachystachys was very evidently P. graminis 

 tritici. From the results obtained with other species of Elymus it is 

 very probable that E. brachystachys can be infected with P. graminis 

 secalis also, although there is no experimental proof (Table XIII). 



Table XIV. — Results of inoculations with urediniospores from Elymus canadensis L. 



a Wheat very distinctly hypersensitive. 



100305°— 17- 



