PLATE 67 
Plasmodiophora brassicae: 
A. —A section through a cabbage stem 21 days after inoculation. The disease has 
spread around the stem and the plasmodia may be seen in the cambium opposite 
the large swelling. X 12. 
B. -kA stage in the infection of the cambium. The plasmodia have not yet begun 
to pass out into the cortex or in toward the wood. Note that the cambium is 
infected far beyond the region of swellings. X 18. 
