Bui. 510, U. S. Dept. of Agriculture. 
Plate IV. 
Lumber Sanitation: Wood-Rottinq Fungi.— IV. 
Fig. 1.— Shortleaf pine which has rotted during 10 months' storage in a retail yard at New Orleans. 
Fig. 2.— A structural pine timber which lay on the ground until severely rotted and was then thrown 
up into a pile of sound lumber. Fig. 3.— Mycelium of a wood-destroying fungus on the face of pine 
boards just uncovered in breaking down a pile (at a height of 6 to 8 boards from the bottom, but 
probably has gone much higher). Figs. 4 to 6. — Polystictus versicolor: 4, Upper surface; 5, lower sur- 
face; 6, plant growing on the end of a hardwood board in a lumber pile. Figs. 7 and 8. — Polystictus 
hirsutus: 7, Upper surface; 8, lower surface. 
