194 



Quercus rubra, Q. alba and O. nigra, beneath which occur Avic- 

 lanchier ca)iade?isis, Hamaniclis virginica and Gaylusaccia rcsinosa. 

 The rock crevices show Campanula rotnndifolia Langsdorfiana, 

 Polypodium vulgarc, Aralia raccniosa, Rubus odoratns and Ribes 

 rotiindifolium, and, on the ledges, clumps of Riibns strigosits. 

 University of Pennsylvania. 



A KEY TO THE BROWN SESSILE POLYPOREAE 

 OF TEMPERATE NORTH AMERICA 



By William A. Murrill 



The pileate species of Polyporaceae have been recently grouped 

 under three subfamilies ; the Polyporeae, with porose hyme- 

 nium and annual hymenophore, the Fomiteae, with porose hyme- 

 nium and perennial hymenophore and the Agariceae, with fur- 

 rowed hymenium. The plants treated in the present key are 

 Polyporeae with brown context and without a distinct stipe. 



Kkv to the Genera. 









Hymenophore sessile. 









Spores hyaline. 









Context light-brown. 









Context at first fleshy, becoming slightly cor 



■ky. 



A. 



ISCHNODER.MA. 



Context tough from the first. 









Surface encrusted. 





B. 



Antrodia. 



Surface not encrusted. 









Surface glabrous or nearly so. 









Hymenium alveolate. 





C. 



Favolus. 



Hymenium normally poroid. 





D. 



Hapalopii.us. 



Surface distinctly hairy. 





E. 



FUNAI lA. 



Context dark-brown. 









Context friable. 





F. 



rHAEOLUS. 



Context tough. 









Tubes entire, pileus heavily bearded. 





G. 



Pogonomyces. 



Tubes soon splitting into teeth, pileus ve 



Ivety. 



H. 



CeRRENEI LA. 



Spores brown. 





I. 



Inonotus. 



A. The Species ok Ischnoderma. 

 Plant large, brown, resinous. /. fuliginosum (Scop.) Murr, 



B. The Si'Ecie.s oe Antrohia. 

 Plant small, brown, zonatc, encrusted. A. //W/i'-f ( Sommerf. ) Karst. 



