Bui. 25, Div. Veg. Phys. & Path., U. S. Dept. of Agriculture. 



PLATE XIV. 



FIG. 1. 



FIG. 3. 

 Fig. 1 EARLY STAGE AND FIGS. 2 AND 3 SUCCESSIVELY LATER STAGES OF THE DECAY 



CAUSED IN White Spruce by Polyporus subacidus Peck. 



