Shade Tkkk and Timiiek DESTKoYiNd Frxcu. 





rig. 65 is from a pliotograpli taken in ISOT. Tliey are line speci- 

 mens, but are much more scattered than is usual with tliis species. 



The fruit l)odies ap- 

 peared during the suc- 

 ceeding seasons of 1898 

 and 1899. During the 

 latter season the tree 

 died from the injuries of 

 the mycelium in its ad- 

 vance on tlie cand)iuni 

 or living portion of the 

 trunk. It was felled, and 

 several sections cut out 

 from the trunk for ob- 

 servation. 



Tlie decay of the heart 

 wood had reached an ad- 

 vanced stao-e so that it was 



65, — Polyp&rus sulphureus. Scattered fruit bodies 

 on lining oak. 



quite soft, and the moisture content was much less than in healthy 

 trees. The lessening of the water 

 content of the heart wood during: 

 the growth and spread of the 

 mycelium caused a shrinkage in 

 the wood. This produced sev- 

 eral radial checks into which the 

 mycelium had grown forming 

 sheets of pure mycelium, some- 

 times called " punk." 



POLYPORUS SULPHUKEUS ImPEIS- 



ONED IN A White Oak. 



A white oak tree about 40 

 years old was growing quite close 

 by the side of a larger tree on the grounds of Cornell University. 

 The tree leaned slio^htly awav from the laro^er one and there was a 

 one sided development of the branches induced by stronger illumina- 

 tion from that side. 



66. — ''Punk" in cracks on oak log. 



