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James Stewart Wiant 



conifers. Comparatively little study has been made of their morphological 

 characters. In view of the apparent differences between strains isolated 

 from conifers during the course of these investigations, it has seemed 

 desirable to make a comparative study of a number of these strains and a 

 further comparison with several strains isolated from vegetables. The 

 studies were divided into two parts: (1) cross-inoculation tests with thir- 

 teen strains on a variety of coniferous and vegetable seedlings; and (2) 

 cultural studies with twenty-three strains on several artificial media. 

 The conifer strains studied were selected as representative of the various 

 types isolated. The several vegetable strains do not represent a wide 

 selection from any particular group of suscepts. The twenty-three strains 

 are listed below, together with the history of each. Those that are starred 

 were used in both cross-inoculation tests and cultural studies, the others in 

 cultural studies only. 



The potato strain was isolated from sclerotia found on the surface of 

 tubers ; the lobelia strain from lesions on the stems and roots of that plant ; 

 the beet strains from lesions on the fleshy roots, those caused by strain 196 

 being of the dry-rot-canker type described by Richards (1921). All other 

 strains were obtained from diseased seedlings. 



With the exception of the following, all strains were isolated by the 

 writer: the cabbage strain, which was a subculture of one isolated by 



