Ply ATE i 
Various stages and arrangements of the typical skinspot pustules. Some tubers 
show mature sori of powdery scab also. All eight specimens_were grown in England. 
A. —Stripe arrangement of the pustules. 
B. —Perfectly flat spots. 
C. D.—Circles of the sori. 
E to H.—Mixed stages of maturity of sori. 
