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



PLATE II. 



INJURIES TO PINES PRODUCED BY CRONARTIUM PYRIFORME. 



FIG. 1. A slight hypertrophy of the trunk of a small tree of Pinus pungcns produced by the 

 seciaof Cronartium pyriforme. ( About one-third natural size.) FIG. 2. Openings produced 

 by the rupturing of the bark of Pinus pungcns by the maturing of the secia of Cronartium 

 (Peridermium) pyriforme. (About one-third natural size.) FIG. 3. A twig of Pinus contorta, 

 showing a fusiform swelling produced by Cronartium (Peridermium) pyriforme on this species 

 of tree. Similar fusiform swellings are produced by the fungus on Pinus ponder -osa. (About 

 one-half natural size.) 



