Bui. 36, Bureau of Plant Industry, U. S. Dept. of Agriculture. 



PLATE XI. 



FIGS. 1, 2. SECTIONS FROM THE TOP OF A FALLEN TREE. 



FIG. 3. SECTION FROM A STANDING PINE, 4 FEET FROM THE GROUND. 



SECTIONS FROM "BLACK-TOP" WESTERN YELLOW PINE TREES, 

 SHOWING ADVANCED STAGES OF DECAY. 



