THE RUSTS OF NOVA SCOTIA. FKASER. 



Melampsoropsis abietina (Alb. & Schw.) Arth. 

 Chrysomyxa Ledi De Bary. 



0. Pycnia amphigenous, numerous, scattered, yellow, 

 becoming reddish-brown, punctiform. 



1. Aecia hypophyllous, on discoloured areas occupying 

 part or all of a leaf, somewhat in rows, flattened laterally, low, 

 dehiscent at apex; peridiurn colourless, lacerate, cells abutted. 

 Aeciospores chiefly ellipsoid, 16-22 by 19-30/*; wall colourless, 

 thick, densely and somewhat coarsely tuberculate, tuberculcs 

 deciduous ; contents orange-red. 



II. Uredinia hypophyllous, on yellow spots, scattered or 

 grouped, small, yellowish-red or brownish-yellow, roundish, 

 about 130fi in diameter; peridium delicate. IJrediniospores 

 elliptical or subglobose, 13-20 by 18-33/n; wall colourless; 

 closely and rather finely verrucose, tubercules deciduous; con- 

 tents orange fading to colourless. 



III. Telia hypophyllous, scattered or chiefly grouped on 

 discoloured areas, small, .1-.3 mm., reddish at first. Telio- 

 spores oblong or cuboid, 11-19 by 16-30/*, in a series 70-90/u; 

 wall colourless, thin, smooth ; contents orange-red, fading to 

 colourless. 



Pycnia and aecia on Picea rubra (DuRoi) Dietr., Pictou. 



Uredinia and telia on Ledum (jroendlandicum Oeder, 

 Pictou. 



The teliospores of this species were germinating freely in 

 the summer of 1910 by ihe second week of June, the first col- 

 lection being on June 10, Aecia were mature by the 17th 

 of July. 



The aecial stage >f this rust, Peridetrmium abietinum 

 (A. & S.) Arth., has not been recognized elsewhere in North 

 America, though it wa^ known in Europe on Picea exceha 

 (Lam.) Link. Cultures were made by the writer in 1910 and 

 aecia were produced on Picea ruhra from a sowing of the 



PBOC. & TRANS. N. S. TNST. Sn., VOL XIT. TRANS. 25. 



