364 THE RUSTS OF NOVA SCOTIA. FRASER. 



Five species are here reported from Nova Scotia. M. 

 Empetri Schroet on Empetrum nigrum L. has been collected 

 in New Hampshire and Quebec so that it may be expected to 

 occur here. 



Melampsoropsis Pyrolae (DC) Arth. 

 Chrysomyxa Pirolae (DC.) Rostr. 



0. Pycnia episquamous, numerous, flat, forming continu- 

 DUS layers, not or slightly elevating the surface, producing 

 yellowish areas on the scales. 



1. Aecia chiefly episquamous, forming bullate swellings, 

 irregularly round, large, crowded and often confluent, finally 

 rupturing the epidermis, very pulverulent ; peridium somewhat 

 convex, soon falling away, cells coarsely tuberculate, resembling 

 the spores. Aeciospores broadly elliptical or obovoid, variable 

 in size, 19-30 by 24-45/*; wall colourless, thick, covered with 

 large, crowded, deciduous lubercules. 



II. Uredinia hypophyllous, small, circular, about 1 mm. 

 in diameter, evenly and thickly distributed, usually occupying 

 the whole under surface of the leaf; peridium delicate, walls 

 smooth, colourless, thin. Urediniospores elliptical or obovate, 

 often somewhat angular, 17-22 by 22-SOfi* wall colourless, 

 distinctly verrucose; contents reddish-orange. 



III. Telia hypophyllous, evenly and closely scattered, 

 Truro; P. elhptica Nutt. Pictou. 



The uredinial and telial stages of this rust are very com- 

 mon near Pictou. In 1910 the uredinia were mature by May 

 7 and the telia germinating by May 20. 



The life history of this species was established by the 

 writer by cultures in the spring of 1911. (See Mycologia 4: 

 183. 1912). The aecial stage on the cones- of Picea was com- 

 inon near Pictou in the season of 1910. It was rather rare 

 the following year. The infected cones are quite conspicuous. 



