Bui. 247, U. S. Dept. of Agriculture. 



Plate 



Injuries to Pines Produced by Cronartium pyriforme. 



Fig. 1. — A slight hypertrophy of the trunk of a small tree of Pinus pungens produced by the 

 aeciaof Cronartium pyriforme. (About one-third natural size.) Fit;. 2. — Openings produced 

 by the rupturing of the bark of Pinus pungens by the maturing 1 of the seciaof Cronartium 



{hi i- ill i rm in in i pyriforme. (About one-third natural size. ) Fig. 3. — A twig "i Pinus contorta, 

 showing a fusiform swelling produced by Cronartium {Peridermium) pi/rijnrmt 'ou this species 

 of tree. Similar fusiform swellings are produced by the fungus on Pinus pondt rosa. (About 

 one-half natural size.) 



