EFFECT OF PARASITIC FUNGI ON THEIR HOST. 



19 



Fio. li.—E.i-ooscas cerasi. Witches' broom of cherry. The supporting branch is 

 dead from its apex backwards to the seat of an infected lateral bud, which has 

 developed into a witches' broom. On the tree the supporting brunch pointed 

 slightly more downwards than is shewn. J natural size. (v. Tubeuf phot.) 



