Bui. 1037, U. S. Dept. of Agriculture. 



Plate I. 



Examples of Wood Infection. — I. 



Fig. 1. — Ralial seition of bull pine, showing liyphfe of tlie 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. — ila^le billet containing sap-rot, a condition brought about 

 through the agency of wood-destroving 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 Ul), pi. 8; fig. 4 is from a photograph by H. D. Tiemann.) 



