THE RUSTS OF NOVA SCOTIA, FRASER. 385 



smooth ; pedicel hyaline or coloured above, equalling or exceed- 

 ing spore, fragile. 



On Hypericum virginicum L., Pictou; H. canadense L., 

 Pictou; II. ellipticum Hook., Pictou, Folleigh Lake. 



This species is very common on the genus Hypericum in 

 the vicinity of Pictou. The teliospores on //. ellipticum show 

 a much less thickened apex than on the other host plants. 



*', . . - 



PHRAGMIDIUM Link. 



Aecia of the caeoma type without peridium, but surrounded 

 by a dense crown of paraphyses. Aeciospores with numerous 

 germ-pores, scattered; wall colourless. Uredinia also sur- 

 rounded by paraphyses. Urediniospores singly not in chains, 

 with numerous germ-pores. Teliospores three or more celled 

 in a vertical row (rarely two celled), usually several germ- 

 pores in each cell. 



This genus occurs only on the rose family. Dietel 

 (Hedwigia 44:344. 1905) records 46 species, of these 17 are 

 found in North America and four are here reported from Nova 

 Scotia. Arthur has added a new species from the western 

 United States. (Torreya 9:24. 1909). 



,. V . ' J f 



Phragmidium americanum Diet. 



0, I & II. Pycnia, aecia and telia not collected. All are 

 formed. 



III. Telia hypophyllous, on reddish-brown, small, irregu- 

 lar spots, mostly scattered, small, black, readily detachable. 

 Teliospores oblong, 46-86 by 24-26/x, obtuse at the apex with 

 colourless apiculus, mostly \ 7-10 celled;- wall dark brown or 

 almost black, verrucose; pedicel longer than the spore, hyaline, 

 swelling in water at base. 



On Rosa species, Pictou, New Glasgow. 



