THE RUbTS OF NOVA SCOTIA. FRASER 433 



Caeoma. 



Aecia without peridia of which the telial forms are not 

 known are classed here. I have collected three of these forms 

 in Nova Scotia , Caeoma nitens on the raspberry, the aecidial* 

 stage of Gymnoconia inter stitialis, a Caeoma on Abies balsamea, 

 which I have shown to be the aecial stage of Melampsora arctica; 

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

 with Melampsora Medusae. 



Roestelia. 



The name Roestelia has been applied to the aecial stage of 

 the Gymnosporangium rusts. The peridium is well developed 

 and dehisces by longitudinal slits, and thus soon becomes 

 fimbriate and revolute. The ISTova Scotia collections are dis- 

 cussed under tho genus Gymnosporangium. 



% 

 LITERATURE. 



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

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



. Uredinales. North 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: 

 225-256. 1909; 2: 213-240. 1910. 



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

 1909. 



. Terminology of Spore Structures in the 

 Uredinales. ]3ot. Gazette 39 : 219-222. 

 1905. 



. Problems in the Stucjy of Plant Rusts. Bot. 

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



