FIG. 65. Exoascus deformans, a very destructive para- 

 site, causing the disease of peach leaves known as ' leaf- 

 curl.' i, two peach leaves distorted and coloured by the 

 fungus ; 2, section of portion of a diseased leaf, showing 

 the asci of the fungus, a, ascus containing spores ; 3, 

 spores free from the ascus producing secondary spores by 

 budding. There are at first eight spores in each ascus, 

 but by a process of budding each spore produces nume- 

 rous very minute secondary spores, so that eventually the 

 ascus is filled with secondary spores. Fig. i, nat. size ; 

 figs. 2 and 3, mag. 



