118 THE KUSTS OF NOVA SCOTIA. ERASER. 



III. Telia hypophyllous (or culmicolous), scattered, 

 oblong, covered by the epidermis, black. Telia oblong-clavate 



or clavate, 15-20 by 35-48/*, 

 apex rounded, truncate or 

 sometimes obliquely pointed, 

 slightly constricted at the 

 septum, base narrowed; wall 



Teliosporcs of Puccinia triticina. thin, brown, slightly tMck- 



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

 numerous. 



On Agropyron vulgare, Pictou. 



This rust on wheat, which can be easily separated from 

 P. graminis by its covered telia, was found to be rather 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 by the presence of paraphyses among the telio- 

 spores, >and the telia remaining covered for a long time by the 

 epidermis, were regarded as one species, Puccinia Rubigo-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. dispersa Erikss. with chocolate-brown 

 uredinia more or less scattered over the leaves. 



Infection experiments have shown the following specialized 

 forms in P. glumarum: 



1. Tritici. 



2. Hordei. 



3. Ely mi. 



4. Agropyri. 



5. Secalis. 



From Puccinia dispersa Erikss. a number of biological 

 species have been separated by -infection experiments, so that 



