Shade Tree and Timber Destroying Fungi. 



251 



species, I searclied diligently for specimens on the trees. In no case 

 in the Adirondacks have I yet found Polyporus sulphur eua on 

 conifers, although it i)robably does occur on them. This suggested 

 that the sheets of punk in the conifers examined were connected 

 with Pohjporus pinicola, and many examples were studied in an 

 endeavor to trace the connection of 

 the sheets of punk in the trunk with 

 the fruit bodies on the exterior. 



The direct connection was diflicult 

 to trace, although in most examples 

 it was not ditticult to trace the punk 

 through the log radially to the bark, 

 but at this point in splitting the bark 

 radially the direct connection of the 

 punk was not seen. The most favor- 

 able examples for study were those 

 in which the fruit body was just 

 originating as a tubercle -i to G cm. 

 in thickness on the outside of the 

 bark. In splitting several of these 

 from the tree a circular patch of the 

 punk was found on the inner surface 

 of the bark and looked very much as 

 if the mycelium issuing from ■ the 

 tree and connected with the fruit 

 body had been riveted on the inner 

 surface of the bark, but on splitting 

 such structures radially no evidence 



of the connection of the bark with the fruiting body was pre- 

 sented. However, on splitting the bark tangentially successive 

 sheets of punk were found between the inner sheet and the fi'uit 

 body. These sheets at certain points extended obliquely and con- 

 nected so that they formed a zig-zag connection. The firm layers 

 of the bark prevented the direct radial exit of the mycelium, 

 but by working in a zig-zag fashion ]>etwen the bark layers, it was 

 enabled to make its exit. Having discovered this, it then became 



85, — Dead stub of red spruce where 

 the mycelium entered. 



