438 THE RUSTS OF NOVA SCOTIA. FRASER. 



: "! 



Urediniospores ellipsoid or oval, 19-24 by 29-35^; wall colour- 

 less, medium thick, minutely verrucose. 



III. Telispores in the epidermal cells, globoid, often 

 irregular 25 by 21-35/*; usually four-celled; wall thin, IP, 

 colorless, smooth. 



On Phegopteris Dryopteris (L.) Fee., Pictou, New Glas- 

 gow, July, 1912. 



The spores appeared so early in spring that it does not seem 

 probable that they are preceded by aecia on another host, so 

 the writer is inclined to regard this species as autoecious. 



The description of the genus and species is based on that of 

 Arthur in the North American Flora as all the spore forms 

 were not present on my collections. 



Puccinia Osmorrhizae (Peck) Cooke and Peck. 

 O. & I. Not present on Nova Scotia collections. 



II. Uredinia amphigenous, scattered, rather small, pul- 

 verulent, cinnamon. Urediniospores mostly ovate, yellowish, 

 about 25 by 28/*; wall echinulate, thick. 



III. Telia blackish, elongate on the stem and" pedicels. 

 Teliospores ellipsoid, rounded at both ends, slightly constricted 

 at the septum, 21-27 by 28-35/>i; wall rather thin, slightly or 

 not at all thickened at the apex, reticulate; pedicel delicate, 

 hyaline, deciduous, shorter than the spore. 



On Osmorrhiza Claytoni (Michx.) Clarke., New Glasgow, 

 July, 1912. 



