Necrosis of the Grape Vine. 



335 



Photo. Nov. 2, 1908 

 Fig. 51. — Photomicrograph of a pycnidiimi. The spores stream out 

 through the opening at the apex 



Original 



Fig. 52. — Drawing to show relation of parasite to host, compound 

 pycnidium, germinated spores, and paraphyses 



