ILLUSTRATIONS. 



PLATES. 



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 

 Fames igniarius. Fig'. 2. — Cross section of a living aspen tree rotted 

 by Fomes igniarius 76 



III. Fig. 1. — Cross section of a living beech tree diseased by /■'■ 



arius. Fig. 2.— cross section of a living red oak tree rotted by Fom* > 

 everhartii ~ 76 



IV. Fig. 1. — Fruiting body of Pohjporus sulphureus. Fig. 2. ( 



section of a living post oak tree rotted by Polyporus sulphun us — 76 



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



VI. Fig. 1. — Cross section of a paper birch tree rotted by Fomes nigricans. 

 Fig. 2. — An abortive fruiting body of Fomes nigricans upon a living 



tree of paper birch 76 



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

 erinaceus. Fig. 2. — Fruiting body of Eydnum erinaa us in a hollow 



log 



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

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



fomentarius 



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 



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



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

 body 



TEXT FIGURES. 



Fig. 1. Oak trees with mistletoe on the branches 



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



mistletoe 



3. Spanish moss on a large oak tree 



4. An aspen tree with many dead lateral branches 



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



out of the opening of an insect burrow 



6. An oak railroad tie with fruiting bodies of Polystictus verswolor... . 



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



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



(Fomes applanatus) 



9. A piece of oak timber rotted by Stereumfrustulosum 



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



"bottom" red oak y 



11. Cross section of an oak railroad tie rot ted by one of the sap-rol tin 



149 



