SHADE TREE AND TIMBER DESTROYING FUNGI. 233 



portions of the trunk where decay has made considerable ^pro- 

 gress, the entire heart being invaded, and the fungus encroach- 

 ing on the " sap " wood. When cut with the cross-cut saw, or 

 even with a finer saw, the ends of the blocks 

 do not show the pockets, since the soft wood is 

 so readily fractured by the teeth of the saw. 

 But when the end of a block is planed off smooth 

 the pockets in transection are quite distinctly 

 brought to view. They are shown in the photo- 

 graph. From a side and end view shown in the 

 photographs the pockets are seen to be oblong 

 in side view and cylindrical in cross section. 

 They are 2 to 3 mm. broad and 4 to 6 mm. long. 

 In the younger portions of the trunk, some dis- 

 tance above the size where logs were cut, and 

 below the point of 

 entrance of the fungus, 

 and thus nearer it, the 

 pockets were not yet 

 formed. This is prob- 

 ably due to the fact that 

 while the mycelium first 

 penetrated the heart 

 wood here, the latter 

 being younger was more 

 resistant, and the pro- 

 cess of disintegration 

 proceeded less rapidly. 

 The pockets appearing 

 on certain of the branches 

 is accounted for by the 

 fact that these branches 

 had been killed for some 

 time, and were consequently in a less 

 condition. 



The formation of pockets by the rapid disintegration of the 

 tissues at many centers recalls the ' ' peckiness ' ' of cypress wood 

 caused by the mycelium of a fungus yet unknown. The pockets 



92. Result of bad 



/runing of 

 i c k or y, the 

 limbs have rot- 

 ted out allowing 

 entrance of fun- 

 gus mycelium. 



93. Proper way to prune, 

 wounds healing up 

 properly. 



resistant 



