PLATE II 
Fig. i.—Section through a sugar-beet seedling which has recovered from an attack 
of Phorna betae, showing a young pycnidium of the fungus forming on the discarded, 
killed tissue. X 500. 
Fig. 2.—Longitudinal section through a sugar-beet seedling which had recovered 
from an attack of root sickness due to Phoma betae, showing the presence of the fungus 
established in a condition of reduced virulence in the living cells. X 530. 
