HEART. WOOD ROT 197 



Polyporus borealis, Fr. Bracket-shaped, or sometimes 

 kidney-shaped and narrowed at the point of attachment, 

 often imbricated ; pileus whitish, hairy ; flesh rather soft, 

 whitish ; pores irregular in form, edges toothed. Allied to 

 P. betulinus. Attacks spruce more especially, causing a 

 white rot of the wood. 



Polyporus squamosus, Fries. Clustered ; pileus broad, 

 thin, rather soft, upper surface whitish and scaly; pores 

 short, becoming irregularly torn; stem short, black at the 

 base, not central. Common on many kinds of broad- 

 leaved trees. 



Polyporus dryadeus, Fr. Bracket-shaped, thick, attached 

 by a broad base, six to ten inches across, brown, rugged, 

 margin paler and exuding drops of water; flesh rusty, 

 velvety, fibrous. Attacks the oak ; the heart-wood is 

 striped with white or yellowish bands. 



Fomes fulvus, Fr. Very hard, convex above and below ; 

 pileus even, downy, tawny, then greyish ; flesh rusty ; pores 

 minute, two to four inches across. Occurs on plum, poplar, 

 hornbeam. 



Fomes hartigit, Allesch. Hard, irregularly bracket- 

 shaped ; pileus reddish-brown, smooth ; flesh tawny, 

 stratose ; tubes not distinctly stratified. Occurs on silver 

 fir and spruce, causing a white rot of the wood. 



Fomes pinicola, Schweinitz. Bracket-shaped, thick be- 

 hind; pileus grey, margin thickened, reddish; hymenium 

 yellowish-white ; flesh white. Occurs on living trunks of 



