66 Rusts [CH. 
Fig. 24. Puccinia graminis. (1) Uredospore stage on wheat; (2) uredo- 
spore stage highly magnified; (8) uredospore stage very highly 
magnified; (4) uredospore germinating; (5) teleutospore stage on 
wheat; (6) teleutospores; (7) a teleutospore germinating; (8) aecidio- 
spore stage on barberry leaf; (9) aecidium cup showing the chains 
of aecidiospores; (10) two aecidium cups. (After Massee.) 
