i Q i 7 ] ARTHUR— RUSTS OF RUBUS 5 J 5 



in accord with tendencies recently pointed out by the writer 11 in 



America 



Not much 



So 



far as now known, geographical range is more important in 

 determining the susceptibility of the host than the species of 

 Rubus. There appears to be 



some 



form 



vated blackberries and raspberries in this country," as suggested 



by Kunkel." 



Probably no other species known are so well adapted for the 

 study of the connection between closely related long and short cycle 

 forms, and their possible evolutionary status. 



The rose Caeoma of northern California is transferred to the 

 genus Kunkelia with some confidence in advance of knowledge 

 regarding the spore germination, partly because no puccinioid 

 form has been found associated with it, and partly because of its 

 general similarity to Kunkelia nitens. 



Purdue University 

 Lafayette, Ind. 



"Arthur, J. C, Rusts of the West Indies. Torreya 17:26. 1917. 

 « Kunkel, L. O., Bull. Torr. Bot. Club 43:569- ioi&. 



