PLATE XI 
Fig. i.—A globoid swelling formed by Peridermium cerebrum on Pinus echinata, 
showing the cerebroid arrangement of the secia. 
Fig. 2 .—A fusiform swelling caused by Peridermium fusiforme on Pinus taeda , 
showing a similar cerebroid arrangement of the secia. 
Fig. 3.—A leaf of Quercus rubra bearing the teliaof Cronartium cerebrum from an 
inoculation with seciospores of Peridermium cerebrum on Pinus virginiana. 
Fig. 4.—A leaf of Quercus phellos bearing the uredinia of Cronartium cerebrum 
from an inoculation with the seciospores of Peridermium fusiforme. 
(250) 
