THE RUSTS OF NOVA SCOTIA. FRASER. 419 



the former P. dispersa Erikss. now consists of the following 

 species : 



P. dispersa Erikss. on rye (Secale cereale). Aecia on 

 AncJiusa species. 



P. triticina Erikss. on wheat (Tnticum). Aecia unknown. 



P. bromina Erikss. on brome grass (Bromus). Aecia on 

 Symphtum officinale and Pulmonaria montana. 



P. agropyrina Erikss. on coach grass (Agropyron repens). 

 Aecia unknown. 



P. holcina Erikss. on Holcus species. Aecia unknown. 



P. Triseti Erikss. on Trisetum flavescens. Aecia unknown. 



Puccinia agropyrina Erikss. 

 & I. Pycnia and aecia unknown. 



II. Uredinia mostly epiphyllous, scattered, small or 

 medium sized, oval or oblong, rusty yellow. Urediniospores 

 globose or sub-globose, 20-27/*, finely echinulate; wall pale 

 yellow; contents yellow. 



III. Telia mostly hypophyllous, often on the sheaths, 

 scattered or sometimes aggregated, oblong, covered by the 

 epidermis, black. Teliospores oblong or . oblong-clavate, 14-21 

 by 40-5 4/u, rounded or obtuse at apex, narrowed toward base, 

 not or slightly constricted at the septum, smooth, brownish; 

 pedicel short, coloured ; paraphy&es present. 



On Agropyron repens L., Pictou. 



This rust is very common on its host near Pictou, 

 especially on the after-grass in hay : fields. Both the uredinial 

 and telial stages were found abundantly in late fall. 



This species may not be identical with the European rust 

 on Agropyron: repens, but it is placed here provisionally, or 

 until infection experiments decide its position. It may be 

 P. obliterates Arth., which has aecia on Thdictrum and 

 Aquilegia. (Arthur, Mycologia 1:250. 1909; 2:225, 1910). 



