Wire Stem of Cabbage 



13 



over the surface and were cinnamon brown in color. Strain P 70 pro- 

 duced large, uneven, irregular, ridge-like, grayish brown masses extending 

 outward from the center of the dish. Strain P 27 formed blackish brown, 

 closely compacted masses in the center of the petri dish. 



TABLE 5. 



Rate of Formation of Sclerotia of Different Strains of Corticium 

 vagum on Media Adjusted to Different pH Values 



* Very few minute sclerotia were formed in two or three 

 observations were made. 



t Sources of strains as in table 3. 



in the twelve days during which the 



The foregoing results are in accordance with the researches of Matsu- 

 moto (1921) and others in that they point to constant differences. Since 

 minor variations in environmental conditions apparently cause such large 

 variations in growth, it would seem futile to attempt to compare these 

 strains with^those of another investigator. 



In addition to observing the growth rate of the mycelium in the tem- 

 perature experiments (table 2), the rate of sclerotia formation was also 



