PLATE IX 



Fig. I. — A sporophore of Polyporus dryof>hilus, tuberous form on Ouercus gambelii; 

 from Arizona. 



Fig. 2. — Sectional view of a sporophore of Polyporus dryophilus on Quercus gambelii, 

 showing the hard granular core with whitish mycelial strands; also the pore layer; 

 from New Mexico. 



Fig. 3. — A sporophore of Polyporus dryophilus on Ouercus californica, showing the 

 upper surface with a faint zonation; from California. 



Fig. 4. — A section through a sporophore of Polyporus dryophilus on Quercus garryana, 

 showing the structiu-e of the hard granular core ; from California. 



Fig. 5. — A front view, showing the margin of the same sporophore as in figure 3, 

 representing the ungulate form. 



Fig. 6. — A view of the pore surface of an applanate sporophore of Polyporus dryophi- 

 lus on Ouercus alba; from Arkansas. 



