Bui. 510, U. S. Dept. of Agriculture. 



Plate I. 



I^'ViilKpfis**?: 





wmmmsm smmms m 



•^'■-■•■-at*.' 



Lumber Sanitation: Wood-Rotting Fungi.— I. 



Fig. 1. — Thin section of "red-heart" pine, showing fungous threads and holes where these have bored 

 through the walls of tlie wood cells. Fig. 2.— Mycelium on a board from a clay mine, Joplin, Mo. 

 Fig. 3. — The mushroom Pluteus cervinus on a rotten log. Fig. 4.— A species of Hydniun. 



