SHADE TREES AND FORESTS 



497 



FIG. 195. Fallen and standing fire-killed timber, Priest River Reserve, Idaho. 



crown fires run up into the crowns of the trees and burn the 

 leaves and small branches. These occur only in the ever- 

 green forests. Ground fires burn in the duff below the sur- 

 face and may burn for weeks and even months without 



2K 



