CROWN RUST 249 



CROWN RUST 

 (Puccinia coronata, Corda.) 



A widely distributed rust, characterised by the apex of 

 the teleutospore being ornamented with a varying number 

 of blunt projections. The aecidia form irregular yellow 

 patches on the under surface of living leaves, also some- 

 times on the flowers and fruit of various species of buck- 

 thorn Rhamnus. 



The uredo and teleutospore stages occur on the upper 

 surface of the leaves, less frequently on the leaf-sheath, 

 culm, and chaff. 



The minute black teleutospore sori often form irregular 

 rings. 



Met with on wheat, barley, rye, and many wild grasses. 



Puccinia phlei-pratensis, Eriks. and Henn. This species 

 in a wild state occurs on Timothy grass Phleum pratense 

 but artificial infection has proved that it can inoculate 

 cultivated cereals. The aecidium stage is unknown. 



Puccinia glumarum, Eriks. and Henn. = Puccinia rubigo- 

 vera, D. C. A widely distributed and destructive species, 

 attacking wheat, barley, oats, and many wild grasses. 



Aecidium stage unknown. Uredo and teleutospore 

 conditions develop on the leaves and inner side of the 

 chaff. Teleutospore sori accompanied by paraphyses. 



Puccinia dispersa, Eriks. and Henn. The aecidium forms 

 irregularly elongated patches on living leaves, stems, flowers, 

 and fruit of Alkanet Anchusa arvensis and A. officinalis. 

 Uredo and teleutospore stages on the leaves of wheat, rye, 



