Bui. 1163, U . S. Dept, of Agriculture. 
Plate III 
Fig. I.—Conk-Rot Caused by Ring-Scale Fungus. Fig. 2.—Cross Section of a Douglas Fir Top. 
This illustrates the typical stage of the decay. In its incipient This shows the upper surface of a sporopho^e of the rose-colored fomes 
stages the rot is indicated by a reddish purple discoloration. and the yellow-brown rot caused by this fungus. 
