Wire Stem of ( Iabbage 7 



mately 8.5 microns. This measurement was compared with others simi- 

 larly obtained from six strains 7 of the same age, isolated from potato 

 tubers and grown on the same medium. 8 No difference in size was ob- 

 served (table 1). 



The strain used throughout this work was isolated from a cabbage 

 seedling in 1920. In 1923 lettuce seedlings were inoculated with this 



TABLE 1. Measurements of Htphae and Sclerotial Cells, in Microns, of 

 Different Strains of Corticium vagum B. & C. 



strain, and the fungus was reisolated. The average diameter of the 

 hyphae of the fungus more recently isolated was not different from that 

 of the fungus grown on potato agar for over two years. Comparisons 

 were made also of the diameters of hyphae of strains from cabbage, bamboo, 

 and aster plants. The hyphae of the last two were consistently of smaller 

 diameter (table 1). 



The sclerotial cells 



The barrel-shaped sclerotial cells so characteristic of Corticium vagum 

 were present in abundance in sevcn-days-old cultures on potato agar 

 (pH adjusted to 5.6). Comparisons of the average length and width of 

 fifty of these cells were made of the strains mentioned above. Again the 

 only differences in size were found in the consistently smaller cells of the 

 strains from the bamboo and aster plants (table 1). The indications 



'The term strains is u-o<l to designate isolations from different sources, as different tubers, different 

 hosts, and so forth, 



8 The following formula was used in the preparation of the medium: pared potatoes, i3*mi grams; dextrose, 

 10 grams; agar, 20 grams; tap water, 1000 cubic centimes r 



