Fig. 65. Rose Diseases. 



0. Pilobolus crystaUinis (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) young sporophore (after Clinton), b. crown gall, c. Phragmidmm sub- 

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



