

FOMES PIN I (Fig. 608). Pileus ungulate, thick, hard, woody. 

 Surface dark brown, rough, tomentose, with concentric raised zones. 

 Context and pore tissue Sudan brown. Pores (Fig. 609) large, round, 

 elongated or sometimes daedaloid, 1-3 mm. in diameter. Pore layers 

 distinct in old specimens. Hymenium tawny, the pores lighter, more 

 yellow than the context. Setae slender, sharp, large, projecting 30-40 

 mic. Spores globose, hyaline, 5-6 mic. 





Fig. 609. 

 Pores of Fomes pini. 



Hartig gives an excellent account of this well-known and de- 

 structive disease of pine trees. It occurs more common in Northern 

 Europe and our Western States, though it is found no doubt in all 

 pine regions. It is usually found on old trees and generally at some 



275 



