454 



BASIDIOMYCETES. 



white wood-spots, so characteristic of Polyporus annosi/s (Tram, 

 radicipcrda), appear only rarely in this species. 



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

 in iht' pine, liowever, it seems to be confined to the heart-wood, 



Fig. -IKi. TnnneicK pini on SpruL-i; (fifni 

 cxc(lm). Sporophore on the stem beneath a 

 snag-branch, (v. Tubetif phot.) 



Fig. 2S4. — y'/-(t„(W..s i,ini on .Spruce. 

 Board showing the characteristic 

 white cellulose-spot.s in the wood, 

 (v. TuVjeuf 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 



