THE RUSTS OF NOVA SCOTIA. FRASER. 355 



On Pyrola elliptica Nutt., Pictou, Oct. 4, 1910. 

 Only the uredinial stage was collected. The species does 

 not seem to be common. 



Pucciniastrum minimum (Schw.) Arthur. 



0. Pycnia hypophyllous, rarely epiphyllous, numerous, 

 scattered, inconspicuous. 



1. Aecia hypophyllous in two rows, 'Occupying part or 

 usually all of the leaf, cylindrical, small, about .5-1 mm. high; 

 peridium colorless, dehiscing at the apex, cells joined loosely, 

 slender. Aeciospores broadly ellipsoid, 13-17 by 19-21>; wall 

 colourless, rather thin, finely and evenly verrucose. 



II. Uredinia hypophyllous, small, scattered or chiefly 

 grouped on indefinite discoloured areas, mammillose, pale 

 yellow, dehiscent by a central pore, finally pulverulent, long 

 covered by the overarching epidermis ; peridium hemispherical, 

 cells smlall, cuboidal. Urediniospores ellipsoid or obovate- 

 oblong, 15-18 by 19-27/*; wall colourless, thin, finely and 

 sparsely echinulate. 



III. Telia amphigenous, chiefly epiphyllous. Teliospores 

 in the epidermal cells, ellipsoid or globoid, 16-24 by 19-35/*; 

 wall uniformly thin, pale yellowish, smooth. 



Pycnia and aecia on the leaves and cones of Tsuga canaden- 

 sis (L.) Carr., Pictou, July, 1911. 



Uredinia and telia on Rhodora canadense (L.) BSP., 

 Pictou. 



This species was found to be rather common near Pictou 

 on Rhodora canadense. The aecial stage was shown by cul- 

 tures of the writer to occur on the leaves and cones of Tsuga 

 canadensis (see Mycologia 4:184. 1912). This stage was 

 determined as Peridermium Peekii by Dr. Arthur. The aecia 

 were much lighter in colour than the much more common aecia 

 on Tsuga canadensis which has usually passed as Peridermium 

 Peekii. The more common form doubtless belongs to 

 Pucciniastrum Myrtilli. 



