CONTENTS 



Page. 



Additions to our knowledge of life histories 9 



Euphorbia rust ( Uromyces euphorbise C. and P. ) 9 



Sunflower rust ( Puccinia helianihi Schw. ) 11 



Crown rust of oats (Puccinia rhamni [Pers. ] Wettst. ) 13 



Segregation of host plants 14 



Black stem rust of Agropyron and Elymus 15 



Orange leaf rust of Agropyron and Elymus 17 



Black stem rust of Agrostis alba vulgaris 17 



Rust of Chloris ( Puccinia cfdoridis Diet, ) 18 



Rusts of willow and cotton wood (Melampsora) 18 



Winter resistance of the uredo .• 19 



Uredo of Kentucky bluegrass rust (Puccinia poarum Niels. ) 20 



Uredo of Puccinia montanensis Ell 20 



Emergency adaptations 21 



Puccinia vexans Farl 22 



Experiments with Lepto-uredinea? 25 



Rust of cocklebur ( Puccinia xanthii Schw. ) 26 



Rust of velvet leaf (Puccinia heterospora B. and C. ) 26 



Perennial species 27 



JEciclium tuberculatum E. and K 27 



Rust of Peucedanum famiculaceum 28 



Description of plates 32 



7 



