PORIA WOOD-ROT 



181 



is covered with irregularly shaped, minute pores, which 

 are often slightly curved or inclined to become elongated. 

 The walls or dissepiments separating the pores are very 

 minutely toothed when seen under a pocket lens. 



t 



" 



, ff 



l 



Fig. 40. Poria vaporaria. i, portion of a fungus, nat. 

 size ; 2, section of same. 



Hartig states that this fungus is very common on spruces 

 and pines as a parasite, attacking roots or parts above 

 ground as a wound-parasite. The mycelium often forms 

 white, branched, floccose strands, somewhat like those of 



