POLYPORACEAE 109 



(2) Stipe annulate Boletopsis 14: 164 



b. Stipe not volvate or annulate 



(1) Stipe central, tubes usually not discrete from each other 



(a) Spores cylindric, minute f Bactroboletus 16: 142 



(Filoboletus) 



(b) Spores globose to fusoid 



x. Pileus and stipe beautifully squarrose-scaly 



Strobilomyces 6: 49 



y. Pileus and stipe not squarrose-scaly 



(x) Layer of tubes separating readily from the hymenophore 



Boletus 6: 2 



(incl. Suillus, Tylopilus 16: 142) 

 (y) Layer of tubes not separating readily from the hymenophore 

 m. Tubes not discrete from each other 



(m) Tubes radiate; hymenophore mucronate 



Boletinus 6: 51 

 (n) Tubes sinuose or gyrose ; hymenophore smooth 



Gyrodon 6: 51 

 n. Tubes discrete from each other 



Fistulinella 17: 101 



(2) Stipe lateral: tubes discrete from each other 



Fistulina 6: 54 

 2. Pileus gelatinous 



a. Stalked ; spores brown 



(1) Pileus single Rodwaya 16:172 



(2) Pileus many, superimposed on the stipe 



Mycodendrum 9:206 



b. Mostly sessile; spores hyaline Laschia 6:404 

 II. Pileus leathery, corky or woody, rarely tough-fleshy 



1. Tubes gelatinous Gloeoporus 6: 403 



2. Tubes not gelatinous 



a. Hymenium covered by a volva-like membrane 



Cryptoporus 17:125 



b. Hymenium not volvate 



(1) Tubes in several layers; perennial, woody 



Fomes 6: 150 



(2) Tubes not stratified in layers 

 (a) Tubes typically pore-like 



x. Tube layer distinct but not separable from the hymenophore ; tough- 

 fleshy to leathery 

 (x) Pileus thick, tough-fleshy, stalked or sessile 



Polyporus 6: 55 



(incl. Laccocephalum 11:87) 

 (y) Pileus thin, coriaceous or membranous 

 m. Pileus stipitate to dimidiate 

 (m) Tubes not spiny inside Polystictis 6:208 

 (n) Tubes spiny inside Mucronoporus 9: 188 



n. Pileus resupinate Poria 6:292 



