352 THE RUSTS OF NOVA SCOTIA. FRASER. 



or oval, sometimes globose, 11-16 by 15-24/t; wall colourless, 

 thin, finely echinulate; contents orange-yellow when fresh. 



III. Telia hypophyllous, indehiscent, flat, small, scattered 

 or often gregarious and confluent, reddish-brown, becoming 

 blackish-brown. Teliospores usually in one layer, oblong or 

 angular by pressure, about 18-30/x high by 16-27/* wide; walls 

 pale brown, smooth, thin, thicker at the apex. 



Pycnia and aecia on Abies balsamea (L.) Mill., Pictou, 

 June, 1911. 



Uredinia and telia on Epilobium angustifolium L., E. 

 Hornmanni Reichenb., Pictou ; E. adenocaulon Haussk., Truro. 

 Arthur gives the measurement of the teliospores as 10-14 

 by 17-35/A. This species is very common on its hosts especially 

 on Epilobium angustifolium. The leaves become discoloured 

 when the telia are well formed, and usually soon die. 



The life history of this species in North America was 

 worked out by the writer. (Mycologia 4: 176. 1912). It had 

 been previously established in Europe, the aecia occurring 

 there on Ribes pectinata DC. The aecia of this rust have 

 not yet been recognized elsewhere in North America. 



Pucciniastrum arcticum (Lagerh.) Tranz. 

 & I. Pycnia and aecia unknown. 



II. ITredinia hypophyllous, usually thickly scattered over 

 extended areas, round, small, orange-yellow, fading to pale 

 yellow, dehiscent by a central pore, somewhat pulverulent; 

 peridium firm, ostiolar cells coarsely echinulate above. 

 Urediniospores obovate or ellipsoid, 13-15 by 16-2 5ft; wall 

 colourless, thin, distinctly echinulate- with low points. 



III. Telia hypophyllous, brownish, small, flat, inconspicu- 

 ous. Teliospores intercellular, globoid or cuboid, about 19-24/u 

 in diameter; wall smooth, light brown. 



On Rubus triflorus Richards, Truro, Pictou ; Rubus idaeus 

 Var. aculeatissimus, (Rubus strigosus Michx.), Pictou, New 

 Glasgow. 



