ILLUSTRATIONS. 



PLATES. 



Page. 



PLATE I. A living aspen tree with several sporophores of Fames igniarius. Frontispiece. 



II. Fig. 1 Cross section of the trunk of a living silver maple rotted by 

 /''om<x igniariiis: Fig. 2. Cross section oi a living aspen tree rotted 



by Fomes ignim-hix 76 



III. Fig. 1. Cross section of a living beech tree diseased by Foincs i</ni- 

 arius. Fig. 2. cross section of a living red oak tree rotted by Fames 

 i-fi rhurfii. 70 



1\'. Fig. 1. Fruiting body of r<>h/jiornx ,s///y>/<///n/.s. Fig. 2. Cro.-s 



section of a living post oak tree rotted by Polycom* sulphureus 76 



V. Fig. 1. Piped-rot of oak. Fig. 2. Piped-rot of chestnut 76 



VI . Fig. 1. Cross section oi' a paper hirch tree rotted by Fomes nigrii-anx. 

 Fig. 2 V An abortive fruit ing body of Fomes nigr icons upon a living 



tree of paper birch 76 



VII. Fig. 1. Cross section of a living white oak tree decayed by Hydnum 

 i r/nii/rns. Fig. 2. Fruiting body of Hydnum erinaceus in a hollow 



log ' 76 



VIII. Fig. 1. A dead beech tree with sporophores of Fomes fomentarius. 

 Fig. 2. Cross section of a dead beech tree rotted by Fomes 



form n/nrius 76 



IX. Fig. 1. A dead yellow birch tree with fruiting body of Polyporus 

 betulinus. Fig. 2. Cross section of yellow birch tree rotted by 

 Polyporus betulinus 76 



X. Fig. 1. An oak railroad tie rotted by Daedalea quercina. Fig. 2. 

 Cross section of the tie shown in figure 1, two feet from the fruiting 

 body 76 



TEXT FIGURES. 



FIG . 1 . Oak trees with mistletoe on the branches 15 



2. A black spruce tree with a large witches' broom caused by dwarf 



mistletoe 16 



3. Spanish moss on a large oak tree 17 



4. An aspen tree with many dead lateral branches 32 



5. A living black oak tree with a sporophore of Polyporus obtusus growing 



out of the opening of an insect burrow 41 



6. An oak railroad tie with fruiting bodies of Polystictus versicolor 54 



7. A living tree of red oak the bark of which was killed by fire 57 



8. A dead stub of a maple tree bearing fruiting bodies of the sap-rot fungus 



(Fomes applanatus] 59 



9. A piece of oak timber rotted by Stereu >' . frustulosum .' 60 



10. Diagram showing relative rate of decay of 2,400 pieces of "hill" and 



"bottom"' red oak 63 



11. Cross section of an oak railroad tie rotted by one of the sap-rot fungi.. . 64 



149 7 



