SHADE TREE AND TIMBER DESTROYING FUNGI. 203 



The fruit bodies are rather soft and spongy. They last only 

 for the season. They are 10 to 20 cm. (4 to 8 inches) long by 6 

 to 15 cm. broad. They form larger masses where several are 

 joined. The upper surface is rough with coarse tufts of 

 mycelium giving it a very shaggy or sodden appearance. The 

 honey-combed surface is below. The hymenium consists of 

 quite regular pores with rounded openings in some specimens, 

 or irregular, elongated and 

 sinuous pores in other 

 specimens, resembling the 

 pores of Dadalea. But 

 they are evenly sunk in 

 the substance of the cap 

 and therefore lack the 

 essential character of that 

 genus. The walls of the 

 pores are thin, and the 

 edges often irregular and 

 jagged. 



There are two cases of 

 its occurrence on living 

 coniferous trees which I 

 have carefully studied. 

 One case is that of a 

 hemlock spruce ( Tsuga 

 canadensis} . The other 

 is that of a red spruce 

 (Picea rubra) , the common 

 timber spruce of the 

 Adirondack region. 



The hemlock spruce 

 was a large tree, 60 cm. 



(2 ft.) in diameter, on a steep slope in one of the deep gorges 

 (Fall Creek) at Ithaca, N. Y. 



This example was observed in the autumn of 1899. The 

 fruit body of the fungus was situated at a large wound on the 

 trunk near the base. It consisted of several caps closely joined 

 at their origin from the trunk of the tree. This is well shown 



59- Polyporus borealis, Hymenium with 

 rounded pores. 



