PLATE 1 02. 

 Greenhouse experiment: 



A. — Marquis, single blade, showing extreme susceptibility. 



B. — Kubanka (C I 2094), single blade; moderately susceptible with slight chlorosis. 



C. — Kubanka X Marquis (222-32 F3 emmerlike family); extremely resistant; 

 uredinia minute surrounded by hypersensitive areas, or flecks. 



D. — Kubanka X Marquis (222-30 F3 emmerlike family): very susceptible. 



E. — lumillo X Marquis (181-24 F3 common family); very susceptible. 



F. — lumillo X Marquis (186-13-5, an individual common plant of F3 family 

 186-13); moderately resistant with infected areas chlorotic. 



G. — lumillo X Marquis (228-37 F3 durum family); moderately resistant vdth in- 

 fected areas chlorotic. 



H. — lumillo X Marquis (186-15 ^s durum family); fairly susceptible. 



I. — lumillo (C I 1736), single blade; slightly susceptible. 



J. — Marquis (Minnesota 1239), single blade; highly susceptible. 



The rust form used in the greenhouse experiment was the same as that used for the 

 1918 field epidemic. 



r 



