THE NINETEENTH ANNUAL MEETING. 



1 2 



95 



Fig. 5. Plum Pockets. Taphrina pruni iFckl.) Tal. 



1. Branch showing iniJated jiliims. 



2. Section throus+i the outer surface of a pocket, showing the mycelium in 

 the tissues. 



3 and 4. Surface view of mycelium between epidermal cells and cuticle. 

 .5. Section showing young asci just pusliing through epidermis, 

 f). Asci in different stages of development, one containing spores. 



7. Asci enlarged, showing development. 



8. Spores germinating. After Sorauer. 



f' "There are several species in the genus Taphrina, and each of them 

 causes abnormal development in some portion of its host plant. In addi- 

 tion to causing the pockets, this same fungus attacks the leaves and young 

 branches, producing the same changes in them as in the fruits. In addi- 

 tion to the European plum (Pniiuis domesfica), it attacks the Canadian 

 (P. Americana), the Chickasaw (P. Chicasa), and the beach (P. onar- 

 itima) plums, besides the dwarf cherry (P. puniila), the wild black cherry 

 (P. serotina), and the choke-cherry (P. Virginiana). 



"This fungus is rather peculiar in its workings, as it does not destroy 



