— 53 



'■*^^*n 



s-iMf^' 



Fig. 183. 



Ceratiomyxa fruticulosa grow- 

 ing on log. Natural size. 



Fig. 184. 



Plasmodiophora brassicae. Club root disease 

 on Cabbage showing hypertrophy of dis- 

 eased roots. 



194 



