SYSTEMATIC BOTANY. 



97 



Fm. 123. 



Uromyces and Melampsora), two-celled (as in Puccinia. or Rusts, 

 Fig. 123, and Gymnosporangium, the so-called Cedar apples, 



Fig. 124. 



Fig. 124), or many-celled (as in Phragmidiuvi). They rupture 

 the epidermis and thus become exposed, but generally remain 

 r I 



