PLATE 55 



A. — Puccinia gratninis tritici compacti on Triticum vulgare (W), barley (B), and 

 Triticum compactum (CW^)— that is on common wheat, barley, and club wheat. 

 Normal development on barley and club wheat, common wheat showing minute 

 uredinia and hypersensitiveness as indicated by sharp flecks. Compare with, figure B. 



B. — Puccinia graminis tritici on Triticum vulgare (W), barley (B), and Triticum 

 com-pactum. (CW) — that is, on common wheat, barley, and club wheat. Normal 

 development on all three cereals. Compare with figiu-e A. 



