Bui. 25, Oiv. Veg. Phys. & Path., U. S. Oept. of Agriculture. 



PLATE XV. 



Fig. 1. Cross section of log of Spruce showing decay caused by 



POLYPORUS SUBACIDUS PECK. 



Fig. 2. Resupinate form of sporophore of Polyporus subacidus Peck 



on Spruce log. 



