DESCRIPTION OF PLATES 
Plate VII. Fig. I. — Polyporus pilotae ; A sporophore on the end of a white-oak log 
from Arkansas. Photograph made 43 days after tree was felled. 
Fig. 2.— Polyporus pilotae: Rot appearing in the butt of a white-oak 
log from Arkansas, showing the holes and white cellulose areas char¬ 
acteristic of this rot in a cross section of a living oak. 
Fig. 3.— Polyporus pilotae: Radial-longitudinal view of a white-oak 
log from Arkansas, showing the honeycomb type of the rot with the 
white cellulose lines and elliptical hollows. 
Fig. 4.— Polyporus pilotae: Rot occurring in a log of Castanea pumila 
from Arkansas; A, concentric layers of the rotted wood; B, white 
cellulose fibers. 
Fig. 5.— Polyporus pilotae: Cross section of a chestnut log from New 
York, showing the central circular rotted zone. 
Fig. 6.— Polyporus pilotae: Radial-longitudinal view of the rot in a 
chestnut log from New York, showing the white pocketed stage. 
VIII. Fig. 1.— Polyporus pilotae: Radial-longitudinal view of the rot in a 
chestnut log from New York. This rot enters at a dead branch and 
then moves down the heartwood of the branch into the trunk. 
Fig. 2.— Polyporus berkeleyi: Radial-longitudinal view of the rot in 
white-oak timber from Arkansas, showing the string and ray form char¬ 
acteristic of its second stage. 
Fig. 3.— Polyporus berkeleyi: A sporophore on a white-oak root from 
Arkansas. 
Fig. 4.— Polyporus frondosus: A sporophore on roots of white oak from 
Arkansas. 
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