352 THE KUSTS OF NOVA SCOTIA. FRASER. 



or oval, sometimes globose, 11-lC by 15-24/x; wall colourless, 

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



IIT. Telia hypophy lions, indchiscent, flat, small, scattered 

 or often gregarions and confluent, reddish-brown, becoming 

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

 angular by pi-essure, about 18-30/x high by 16-27)u. wide; walls 

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



Pycnia and aecia on Ahies halsamea (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)",. This species is very common on its hosts especially 

 on Epilohiuin 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 Ri}>cs pcctinala DO. The aecia of this rust have 

 not yet Iven recognized elsewhere in ISTorth America. 



Pucciniastrum arcticum (Lagerh.) Tranz. 



& T. T*ycnia and aecia unknown. 



II. Uredinia hypophyllous, usually thickly scattered over 

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

 yellow, dehiscx?nt by a central pore, somewhat pulverulent ; 

 peridium firm, ostiolar cells coarsely echinulate above. 

 TJrediniospores obovate or ellipsoid, 13-15 by lG-25ju; wall 

 colourless, thin, distinctly echinulate with low points. 



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

 ous. Teliospores intercellular, gl(»l)r»i(l oi- cuboid, about 19-24/u 

 in diameter; wall smooth, light brown. 



On Ruhus triflorus Richards, Truro, Pictou ; Rubus idaeus 

 Var. aculeatissimus, (Ruhus strigosus Michx.), Pictou, !N"ew 

 Glasgow. 



