THE RU.ST8 OF NOVA SCOTIA. — FRA8ER 433 



Caeotna. 



Aecia without peridia of which the telial forms are not 

 known are classed here. I have collected three of these form!? 

 in N'ova Scotia, Caeoma nitens on the raspberry, the aecidial 

 stage of Gymnoconia interstitialis, a Caeoma on Abies halsamea, 

 which I have shown to be the aecial stage of Melampsora ardica, 

 and Caeoma Ahietis-canadensis Farl., which I have connected 

 with Melampsora Medusae. 



Roestelia. 



The name Roestelia has been applied to the aecial stage of 

 the Gymnosporanrjium rusts. The peridium is well developed 

 and dehisces by longitudinal slits, and thus soon becomes 

 fimbriate and revolute. The Xova Scotia collections are dis- 

 cussed under tli^ genus Gymnosporangium. 



; LTTERATUEE. 



Arthur J. C. Amphispores of the Grass and Sedge Rusts. 

 Bull Torr. Bot. Club 32 : 35-41. 1905. 



. Uredinales. Xorth Am. Flora 7: 85-160. 1907; 



- 161-268.1912. 



• . Cultures of the Uredineae. Bot. Gazette 29 : 



- 268-276. 1900 ; 35 : 10-23. 1903. Jour, oi 



Mycology 8: 51-56. 1902; 10: 8-21. 1904: 

 11:50-67. 1905; 12:11-27. 1906; 13:189- 

 205. 1907; 14: 7-28. 1908. Mycologia 1: 

 22,5-256. 1909; 2: 213-240. 1910. 



. 'North America Rose Rusts. Torreya 9: 21-28, 



1909. 



. Terminology of Spore Structures in the 



Uredinales. Bot. Gazette 39: 219-222. 

 1905. 



• — ■ -—. Problems in the Study of Plant Rusts. Bot. 



Soc. of America; Publication 22: 1-18. 



