PLATE XLI 



Fig. I. — Quercus alba: A radial view of the honeycomb heart-rot produced bv 

 Stereum suhpileatum, showing various stages of the rot; from Arkansas. 



Fig. 2.— Quercus alba: A radial view of the last (honeycomb) stage of the rot; from 

 Arkansas. 



Fig. 3. — Quercus alba: A tangential view of honeycomb-rot, showing early stage of 

 delignification; from Arkansas. 



Fig. 4. — Quercus velutina: A radial view of honeycomb heart-rot as it occurs in tops 

 of trees, showing pockets filled with strands of cellulose ; from Arkansas. 



Fig. 5. — Quercus alba: A radial view of the honeycomb-rot, showing pockets lined 

 with cellulose; from Arkansas. 



Fig. 6. — Quercus alba: A cross-sectional Adew of the honeycomb heart-rot, showing 

 pockets limited by large medullary rays; from Arkansas. 



Fig- 7- — Quercus alba: Radial view of honeycomb heart-rot in branch, showing last 

 stage of rot; from Arkansas. 



Fig. 8. — Quercus lyrata: Radial view of honeycomb heart-rot in old log associated 

 directly with the sporophores of 5. subpileatum; from Louisiana. 



Fig. g.— Quercus texana: Sporophore of 5. subpileatum; from Arkansas. 



Fig. 10. — Quercus palustris: Sporophore of S. subpileatuyn, conchate form; from 

 Arkansas. 



