TREES AND TIMBER 



425 



soil by means of the fine roots and infect neighboring trees. 

 Upon newly cleared land diseased roots of forest trees may 

 be a source of infection to fruit trees subsequently grown 

 thereon. 



Polyporose (Polyporus versicolor). See p. 429. 



P'lu. 184. — Ariiiillaria uiellea attacking a tree. After Freeman. 



Red rot {Fomes annosus Ft.). — Though not very de- 

 structive in this country, this fungus has been found on 

 many of the pines, where it brings about a red rot of the 

 root system, which ultimately results in the death of an 

 affected tree. The fruiting bodies form small, cup-shaped 

 or irregular masses on the roots or around the base of the 



