THE RUSTS OF NOVA SCOTIA. FRASER. 407 



IL Uredinia hypophyllous, small, 011 pale spots, roundish, 

 surrounded by the ruptured epidermis, pulverulent, cinnamon- 

 brown. Urediniospores sub-globose, ellipsoid or obovate, 18-22 

 by 22-2 ( 7fi; wall thin or thick, echinulate, pores 2 or 3, 

 equatorial. 



III. Telia hypophyllous or caulicolous, scattered or 

 aggregated, sometimes confluent, linear or oblong on the stem, 

 rounded on the leaves, purverulent, blackish-brown. Telio- 

 spores ellipsoid or sub-globose, 22-27 by 27-35/A, rounded at 

 both ends, a small hyaline papilla at apex, little or not con- 

 stricted at the septum; wall chestnut-brown, smooth; pedicel 

 slender, hyaline, usually much longer than the spore. 



On Mentha arvensis Var. canadensis (L.) Briquet, Pictou, 

 Piedmont, 



Burril separated the American rust on the mints as Var. 

 americana on the grounds that the teliospores are more strongly 

 verrucose and more globose in shape. The collections from 

 this vicinity agree more nearly with the European form, the 

 teliospores being smooth. 



The aecia are much less common than the other forms. A 

 collection from Loch Broom, near Pictou, showed an abundant 

 development of this stage, but the peridium had not opened 

 when the collection was made. The infected plants grew in 

 a shaded position. 



The species is worldwide in its distribution, occurring on a 

 large number of mints. It may be that several species are 

 included in this one. 



Puccinia Glaucis Arthur. 

 0. Pycnia not seen, probably obsolete. 



III. Telia amphigenous, solitary or sometimes confluent 

 in groups, 1.5-2 mm. across, roundish, 0.5-1 mm. in diameter, 

 soon naked, pulvinate, compact, dark brown, becoming grey by 

 germination of the spores, ruptured epidermis inconspicuous. 



