600 

 Plate I 



STATE BOARD OF AGRICULTURE. 



Michigan Technical Bulletin No. 53 





Mr jW-: 



■to »■ 



:^ 





Plate I. (a) Pycnidium showing ostiolei 



(b) Pycnidium showing neck. 



(c) Spores. 



(d) Germinating spores. 



(e) Group of pycnidia as the appear on the host plant. 



(f) Pycnidium showing discharge of spores. 



