HEMIASCOMYCETES 



269 



yeasts while yet in the ascus, which results in the ascus 

 finally becoming crowded with a large number of minute 

 secondary spores. 



FIG. 66. Exoascus pmni, a parasite attacking plums, 

 causing distortion of the fruit, i, portion of branch of a 

 plum-tree bearing three diseased plums ; 2, section through 

 a diseased plum. Slightly reduced. 



Many species are injurious parasites, as ' Peach leaf-curl, 

 ' Plum-pockets,' etc. Some species cause the formation 

 known as ' witches' brooms.' Most abundant in Europe, 

 but probably widely distributed. 



