FUNGOUS DISEASES. II5 



of the shepherd's purse reproduced natural size. 

 The reader needs to bear in mind that these roots 



Fig. 22— Club Root of Shepherd's Purse. 



are neither large nor fleshy, and the galls are corre- 

 spondingly small. The enlargement is usually just 

 below the crown, but other parts of the root system 



