1915] 



DUGGAR — RHIZOCTONIA CROCORUM AND R. SOLANI 



441 



tubes seem to pass into such empty cells as readily as directly 

 into the nutrient solution. When the germ tube is from 10 fi 

 to 20 n in length, it is invariably narrowed towards the outlet 

 from the parent cell, and a septum forms at a short distance 

 from this outlet." 



Fig. 8. 



Rhizoctonia Solani: Lobulate, moniliform, and elbowed cells from 

 tufted growth in artificial culture. 



The hyphae which penetrate the tissues remain colorless so 



long as they are in active growth, and while generally less 

 in diameter they present much the same appearance as the 

 young external hyphae. In the different strains which have 

 been studied, originating from different hosts, certain minor 

 modifications of the general habit of the fungus in culture 

 have been observed. But these have not seemed to be suffi- 



