Fig. 65. Rose Diseases. 



a. Piloboltis crystallinis (i) Group of sporophores, (2) specks on leaf, ("3) 

 method in which the spore bearing cap is blown off, (4) spore head magni- 

 fied, (5) yonng sporophore (after Clinton), h. crown gall, c. Phragmidium sub- 

 corticum (after Smith, R. E.), d. powdery mildew. 



