Bui. 1037, U. S. Dept. of Agriculture. 
Plate I. 
Examples of Wood Infection 
Fig. 1. — Radial section of bull pine, showing hyphae of the blue-stain fungus growing in the pith 
rays. Fig. 2. — Tangential section of the same, showing many small hyphse growing into 
the adjoining cells. Fig. 3. — Log of southern yellow pine containing sap-stain. Fig. 4. — 
Mycelium of mold growing between hard-maple boards in a kiln. Fig. 5.— Mold on the end of 
a sawed red-oak billet. Fig. 6.— Maole billet containing sap-rot, a condition brought about 
through the agency of wood-destroying fungi. The surface has been polished to show more 
clearly the bleached and disorganized condition of the sapwood. (Figs. 1 and 2 are from Von 
Schreiik (41), pi. 8; fig. 4 is from a photograph by H. D. Tiemann.) 
