454 



BASIDIOMYCETES. 



white wood-spots, so characteristic of Polyporus annosiis {Tram, 

 radiciperda), 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, 



^\"\^ Mii^ 



Fig. 283. — Trainetes pint on Spruce {Picea 

 excelaa). Sporophore on the stem beneath a 

 snag-branch, (v. Tubeuf pbot.) 



Fig. 2S'k.—Tramete8 pint on 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 



