56 



changed as to leave cellulose fibers. Near the Ijottom of the figure note a cavity 

 lined with mycelium. 



Fig. 3. Radial view of White Spruce wood decayed still further by the same fungus. 

 The wood is soft and flaky and is being changed to cellulose here and there. 



PLATE XV. 



Fig. 1. End view of a Spruce log similar to the one shown on Plate XIV, fig. ], 

 showing how the summer wood of every annual ring has been ("hanged, leaving cel- 

 lulose fibers. 



Fig. 2. View (about natural size) of the resupinate sporophore of Folyporus subaci- 

 dus Pk. on Spruce log, showing how it creeps over the bark. 



o 



