RUST FUNGI 



203 



Phalaris arnudituicea; (3) f. sp. agroslis on Agrostis mdgaris and A, 

 stolonifera. 



Yellow Rust of Wheat, Puccinia glumarum, without any known 

 aecial stage. It has according to Eriksson the following specialized 

 forms: (1) f. sp. tritici on wheat; (2) f. sp. secalis on rye; (3) f. sp. 

 hordei on barley; (4) f. sp. Elymi on dymus arenarius; (5) f. sp. 

 agropyri on couch grass, Agropyron repens. 



Fig. 72. — Hollyhock rust. Puccinia mals/acearum. {Nantucket, August 19, 1915.) 



Brown Rust of Wheat, Puccinia triticina, with aecia unknown. 



Dwarf Rust of Barley, Puccinia simplex. 



Timothy Rust, Puccinia phlei-pratensis. Experiments to get thi'^ 

 form to infect barberry leaves have met with indifferent success. 



Chrysanthemum Rust, Puccinia chrysanthemi, on leaves of Chry- 

 santJiftnum sitiense in greenhouses all the year round. 



