:HS Till-; Kl'STS OK NONA SCOTIA. — -l"l{ ASKK. 



[he telial stage is rather coiinnou on ilu- large-toothed 

 aspen about Pictoii. fi is rather rare on the more common 

 poplar, (Popular irciiiuloldes ]\[iehx.V The uredinial stage 

 is not eonspieuons but leaves, Avhen the lelial stage a|>pears in 

 the fall, soon turii black and ai'e then (piite conspicuous. 



Melampsora arctica llostr. 



Uredo Boslruplana Arth. 



0. Pycnia amphigenous, chiefly hvpftphyllous, punctiform, 

 incons]>icuous, honey-yellow. 



T. Aecia hypophyllous, arranged in two rows, roundish, 

 oval or oblong, pale orange-yellow, fading to colourless, sooti 

 naked, pulverulent, ruptured epidermis evident, .2-.P> by .3-.7 

 mm. Aeciospores globoid, about 10-21iu in diameter; wall 

 thick, colourless, verrucose, contents pale yellow. 



IT. Uredinia chiefly hypophyllous, scattered, round, very 

 small, orange-yellow fading to ])ale yellow, somewhat pulveru- 

 lent, ruptured epidermis inconspicuous. (Irediniospores ellip- 

 soid or obovate, small, 14-16 by 10-20/^; wall colourless, thin, 

 uniformly and closely verrucose; paraphyses mixed with the 

 spores, smooth, alxtut r>(V long with heads about 22^ broad, 

 wall thickened al>ove. 



III. Telia mostly hypophyllous, rounded or irregular, 

 scattered or often confluent, slightly elevated, reddish brown, 

 l^ecoming dull bwwn, subepidermal. Teliospores prismatic ov 

 obbmg. 8-10 by 22-82/x; wall .smooth, pale brown, thin. 



Pycnia and aecia on Ahies hahamea (L.) Mill., Pictou. 



Uredinia and tclia on Halix iliscolov Midd.. and «^. lodrata 

 Kichards, Piet<m. 



This rust can be distinguished from .1/. Blgelowii by the 

 small and thin walled urediniospores. it is oommon in the 

 vicinity of Pictou. Cultures by the writer during the spring 

 of 1912 showed that the acxiial stage is on Ahies hnUamea. 

 rSe« Mvcoloiria 4: 187. 1912). 



