Order II. POI^YPORBI. 



Hymenium spread on the inside of tubes or pores, which are 

 sometimes broken up into teeth or concentric plates. At first 

 the tubes are merely circular ridges, but finally extend into 

 tubes. 



The following genera are included under this natural 

 order, viz: 

 B01.ETINUS. — Tubes not easily separable from hymenophore, 



and with a radiating structure. 

 Strobilomyces. — Tubes not easily separable from hymeno- 

 phore, and without a radiating structure. 

 Boletus. — Tubes easily separable from the hymenophore and 



from each other. 

 PoLYPORUS. — Trama (tube partition) dissimilar in substance 



from the hymenophore. 

 TrameTES. — Trama similar in substance and color with 



hymenophore. 

 D^DALEA. — Tubes labyrinthiform, ligneous. 

 Merulius. — Tubes incomplete, shallow sinuous folds, plant 



waxy. 

 PoROTHELiUM. — Hymenium papillose and submembranaceous. 



No specimens discovered in the Lehigh Valley. 

 FisTULiNA. — Hymenium at first papillose, papillae at length 



elongated and forming tubes ; plant fleshy. 



Genus XLIH. BOI^BTINUS. Kalch. 

 This genus was founded by Kalchbrenner on the characters 

 of Boletus cavipes as a type, viz : Hymenium not even, but 

 extended into the tubes. Tubes not easily separable from the 

 hymenophore and from each other and with a radiating 

 structure. 116 



