TREES AND TIMBER 



411 



type (Fig. 184). After the decay within is well under 

 way the spore-bearing toadstools appear upon the surface 

 of the diseased parts, and are quite generally recognized by 

 lumbermen as a sign of rottenness within. 



Fig. 175. — Stump of limb improperly removed. After Ind. Agr. Exp. Sta. 



A branch, broken or sawed off, split by wind, bruised 

 by a falling tree, gnawed by animals, pecked by birds, 

 eaten by insects, or wounded in some other way, may re- 

 sult in the exposure of heart or sap wood to the fungous 



