292 MANUAL OF TREE DISEASES 



bark, not being affected in the pine, cause the formation of the 

 fruiting-bodies to be limited to branch wounds where the 

 branch stub forms an outlet for the mycelium. 



Red-Brown Sapwood-Rot 



Caused by Fames pinicola Fries . 



Pines, as well as spruce, fir, larch and hendock, are every- 

 where commonly affected by this red-brown sapwood-rot. 

 The organism causing the rot also grows saprophyticaUy and 

 is the most common fungus on coniferous wood. The wood is 

 reduced to a red-brown powdery mass which is held together 

 by the many sheets of mycelium which rim in all directions. 

 The sporophores of the causal fungus have a red varnished 

 margin and cream-colored under sm^ace. Further details 

 concerning this disease will be found under fir diseases, on page 

 165. 



Brown Heaetwood-Rot 



Caused by Fames officinalis Fries ( = Fames laricis (Jacq.) MTirrill) 



In western United States pine is destructively attacked 

 by this brown heartwood-rot. Larch, Douglas fir and other 

 conifers are affected by the same rot. Sugar, western yellow 

 and lodge-pole pine are more damaged than other species. 

 The decay resembles to some extent the brown checked wood- 

 rot caused by Polyporus sidphurevs. The decayed wood is 

 brown or red-brown, and felts of mycelium form in checks in 

 the wood. The sporophores of the causal fungus are not 

 formed abundantly. They are large, globose or hoof-shaped 

 bodies with a white chalky upper surface. The inner substance 

 is bitter and has a mealy odor. Further details concerning 

 this heartwood-rot will be found imder larch diseases, on 

 page 216. 



