-^ 



Fig. 92. — Plasmodiophora brassicae. a, a young turnip 

 showing the early stage of the diEease ; 2, a cabbage plant 

 with clubbed root ; 3, two diseased cells from the root of 

 a cabbage, one contains Plasmodium, the other is crowded 

 with the minute spores of the parasite ; 4, three myxa- 

 moebae or moiile bodies produced by the spores on 

 germination, very highly mag. 



