PLATE 66 
Plasmodiophora brassicae: 
A. —A section through a cabbage stem 17 days after inoculation. The swelling is 
increasing, and the parasite may be seen spreading along the cambium. X 12. 
B. —A section through a stem 19 days after inoculation. The swelling is much 
larger than it was two days earlier. The plasmodia are also getting larger, as is 
shown by the size ot the dark bodies in the cells. X 12. 
