Bui. 1037, U. S. Dept, of Agriculture. 
Plate I. 
Fig. 1.—Radial section of bull pine, showing hyplue of the blue-stain fungus growing in the pith 
rays. Fig. 2.—Tangential section of the saine, 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 
Schrenk (41), pi. 8; fig. 4 is from a photograph by H. D. Tiemann.) 
