864 THE RU.STS OF NOVA SCOTIA. FRASER. 



Five species are here reported from oSTova Scotia. M. 

 Empetri Schroet on Eiiipdrum nigrum L. has been collected 

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

 occur here. 



Melampsoropsis Pyrolae (DC) Arth. 

 Chrysomyxa Firolae (DC.) Eostr. 



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

 3US layers, not or slightly elevating the surface, producing 

 yellowish areas on the scales. 



1. Aecia chiefly episquamous, forming bullate swellings, 

 irregularly rouml, large, crowded and often confluent, finally 

 ru])turing the e])idermis, \ cry ])ulv('rulent ; ))oridiuin somewhat" 

 convex, soon falling away, cells coarsely tuberculate, resembling 

 the spores. Aeciospores broadly cni])tical or obovoid, variable 

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

 large, crowded, deciduous Uibercules. 



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

 in diameter, evenly and thickly distributed, usually occupying 

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

 smooth, colourless, thin. Ure(linios])ores elliptical or obovate, 

 often somowhat angular, 17-22 by 22-30/x- 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 (his rust arc^ very com- 

 mon near Pictou. In iOlO the uredinia were matui-c by May 

 7 and the telia germinating by May 20. 



The life history ot this s])ecies was established by the 

 writer by cultures in the sju'ing of 1011. (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. 



