EFFECT OF PARASITIC FUNGI ON THE FORM OF HOST-PLANT. 23 



ranunculoides under the influence of Aecidium punctahim. In 

 the simpler cases the floral leaves were narrow, elongated, and 

 greenish, stamens were formed but not carpels; in more pro- 

 nounced cases, the petals were only represented as small, simple, 



Fig. 5. — Cherry tree in blossom, with three "witches' brooms" in foliage, 

 (v. Tubeuf phot.) 



stalked, green leaves, the stamens were reduced in number and 

 there were no carpels. One case exhibited, in place of a flower, 

 only two leaflets terminating the flower-peduncle, one of them 

 palmately divided. 



