398 THE RUSTS OF NOVA SCOTIA. FRASER. 



I. Aecia hypophyllous and petiolicolous in groups on pale 

 yellowish spots 1-3 mm. in diameter, hemispherical; peridiuin 

 poorly developed. Aeciospores globose or ellipsoid, 17-20 by 

 20-30/*; wall pale yellowish, medium thick, densely and finely 

 verrucose. 



II. Uredinia amphigenous, on yellow or purple spots, 

 scat ered, small punctiform, pulverulent, cinnamon. Uredinio- 

 spores globose or subglobose, 22-27/A; wall yellow, finely 

 echinulate. 



III. Telia similar to the uredinia but dark brown. Telio- 

 spores ellipsoid, rounded at the base and apex, slightly con- 

 stricted at the septum, 24-30 by 33-54/*; wall uniformly thin, 

 finely but distinctly verrucose; pedicel hyaline, short, 

 deciduous. 



On Prenanihes altissima L., New Glasgow, Folleigh Lake. 

 This species occurs rather sparingly on its host, but is 

 probably generally distributed. 



Puccinia Onopordi Syd. 



0. Pycnia not observed. 



1. Aecia unknown, probably not formed. 



II. Uredinia amphigenous, mostly epiphyllous, usually on 

 pale yellowish spots, small, scattered, pulverulent, soon naked, 

 surrounded by the ruptured epidermis, light brown. Uredinio- 

 spores globose or subglobose or ellipsoid, about 27-39;* in 

 diameter, or 24-30 by 27-35/x; wall brown, distinctly but 

 sparsely echinulate with fine points. 



III. Telia amphigenous, scattered on leaves, crowded and 

 abundant on the stem, small and rounded on leaves, soon naked, 

 mostly oblong on the stem and covered for some time by the 

 epidermis, at length naked, pulverulent, dark brown. Telio- 

 spores variable in shape, often ellipsoid or oblong, 22-27 by 

 38-54/x; mostly rounded above, often narrowed toward the 

 base, not or slightly constricted at the septum ; wall uniform 



