454 



BASIDIOMYCETES. 



white wood-spots, so characteristic of Poly-porus annosus (Tram. 

 radiciperdcC), appear only rarely in this species. 



The destruction of spruce and fir goes on from pith to bark ; 

 in the pine, however, it seems to be confined to the heart-wood, 



::W : ' 



FIG. 2.S3. - Ti-umetes pini on Spruce (Piria 

 i.m/xn). Sporophoro on the stem beneath a 

 snag-branch, (v. Tubeuf phot.) 



FIG. 284. Ti-aiiutix jn,>; mi Spruce. 

 Board showing the characteristic 

 white cellulose-spots in the wood. 

 (v. Tubeuf phot.) 



and is prevented from entering the sap-wood by a firm zone 

 permeated with resin. 



Remedial measures are the removal of all diseased stems 



