12 



Levi Otto Gratz 



sclerotia formation at the various pH values for the different strains. 

 This is further illustrated in Plate V. The potato strain, typical for all 

 six tested, is shown to be the most rapid, followed by the aster strain, 

 while but very few minute sclerotia had been produced by the cabbage 



TABLE 4. Rate of Growth and Formation of Sclerotia of Strains of Corticium 



VAGUM AFTER TWELVE DAYS ; ON VARIOUS AflD MEDIA * 



* b, mycelium brownish in color; B, mycelium a deep brown; w, mycelium white; s, sclerotia present; 

 C, entire plate covered with mycelium; numerals denote actual diameter, in centimeters, of the area covered 

 with mycelium. 



t Sources of strains as in table 3. 



and bamboo strains. This was consistent for each of the seventeen petri 

 dishes per strain, where sclerotia were produced. Another sharply denned 

 difference was noticed between the sclerotia of the different potato strains 

 themselves, namely, in the habit of their formation in the petri dishes 

 (Plate VI). Those produced by strain P 13 were uniformly scattered 



