418 THE HUSTS OV NOVA SCOTIA. — FKASEU. 



III. Telia bypophylloiis (or ciilmicolous), scattered, 



oblong, covered bv tbe epidermis, black. Telia oblong-clavate 



/^i P^r-^ or olavate, 15-20 by 35-48/i, 



/ ■ W vjl fCj) f~l/ in) ^P^'^ rounded, truncate or 



\1 I 1 i I / Ml M ?"»ictime5 obliqued pointed, 



\Z \J ^ ^ { I /) slig-btly constricted at tbe 



t/ y^ septum, base narrowed ; wall 



Teiiosporcs of Puccinia triticina. thin, brown, sHgbtly thick- 

 ened at the apex ; pedicel short, coloured ; paraphyses brown, 

 numerous. 



On Agropyron vulgarc, Piotou. 



This rust on wheat, which can be easily separated from 

 P. graminis by its covered telia, was found to be rathcn* com- 

 mon, in this vicinity. It may not be identical with the 

 European species, but, until culture experiments have been 

 tried, may be placed here provisionally. 



Formerly the rusts on wheat and other grasses, which are 

 characterized bv the presence of paraphyses among the telio- 

 spores, and the tclia remaining covered for a long time by the 

 epidermis, were regarded as one species, Puccinia Ruhigo-vera 

 (D. C.) Winter. Eriksson and Henning in 1896 divided this 

 species into two on the grounds of differences in the uredinia. 

 P. glumarum with bright orange uredinia arranged more or 

 less in rows, and P. rlisprrsa Erikss, with chorolatc-brown 

 uredinia more or less scattered over the leaves. 



Infection experiments have sho'^^^l the following specialized 

 forms in P. ghimnrum: 



1. Tnlici. 



2. Tlordei. 



3. Elymi. 



4. Agropyri. 



5. Secalis. 



From Puccinia dispersa. Erikss. a number of biological 

 species have been separated by infection expcrinients, so that 



