250 



Bulletin 193. 



])arts at once change to a dark brown or blackish color. "When 

 dry, however, this test will not yield the results desired, l)ut 

 section the plant through the middle perpendicularly and compare 

 the color and structure of the tube strata. In Polypo7'us ajpplan- 



atiis the strata are deeper and 

 very clearly differentiated. They 

 are also of a dark gray, or hair- 

 brown color, while the tube strata 

 of P olypoyms phiicola are whitish 

 or yellowish-brown, and while 

 clearly differentiated are not so 

 distinctly so as in Polyporus 

 apjylanatus. 



The fruit bodies of Polyporus 

 p)inicola are sometimes found on 

 the trunks of living trees, but 

 nuich more frequently they do 

 not appear until the tree is dead. 

 They are quite common on dead 

 standing trunks and stumps and 

 on fallen logs. They continue to 

 grow after the tree is dead and 

 in quite an advanced stage of 

 decav. 



In wood which is in quite an 

 advanced stage of decay exten- 

 sive sheets of mycelium forming 

 " punk " are often in the crevices 

 formed by the checking of tlie 

 wood. These sheets of punk are 

 very similar to those formed by 

 Polyporus sulpliiireus in decidu- 

 In the larffe number of cases in 



84. — " Dozed " "place in bu tt of red 

 spruce from mycelium of Tra- 

 metes ahietis^ 



ous as well as in cojiiferous trees. 



winch T have found these sheets of punk in rotten logs or decay, 

 ing tree trunks of conifers in the Adirondack mountains, I have 

 not found any fruit bodies of the Polyporus sulpJmretts. Since 

 these sheets of punk found in conifers are usually ascribed to this 



