KEY TO THE MORE IMPORTANT GENERA OF FAMILY POLYPORACEAE 517 



Stipe central or lateral; tubes large, alveolar, often radially elon- 

 gated; growing on wood. Favolus 

 Context duplex; spongy above, woody below; centrally stipitate; 

 tomentose. Abortiporus 



(Heteroporus) 

 Without stipe; sessile to effused-reflexed (rarely resupinate). 

 Pileus more or less firm, flexible or rigid. 



Context duplex, spongy above, firm below. Spongipellis 

 Context uniform; hymenium at maturity more or less smoke- 

 colored. Bjerkandera 

 Context uniform, hymenium white or pallid. 



Fleshy to fleshy-tough; friable when dry. Tyromyces 



Punky to corky; not friable when dry. Trametes 



Pileus thin, leathery and more or less flexible; surface usually zonate. 

 Hymenophore preceded by a cup-shaped sterile body. 



Poronidulus 

 Hymenophore normally pileate; tubes small and mostly regular; 

 pore layer not violet-colored; true cystidia lacking. 



Coriolus 

 Hymenophore semi-resupinate; tubes large and irregular; dentate 



but not irpiciform. Coriolellus 



Hymenophore pileate; tubes early breaking up into flat, tooth- 

 like plates; margin and pore surface when young violet- 

 colored; true cystidia present. Hirschioporus 

 Effused-reflexed or resupinate; poroid remains visible only at 

 margin. Irpex 



(Irpiciporus) 

 Context bright-colored; yellow to red; not stipitate. 



Tubes broad and long; trama orange-red. Aurantioporellus 



Tubes small; trama orange to red; of moderate size. 



Pycnoporus 

 Tubes small; trama and tubes yellow; large; imbricate. 



Laetiporus 

 Context brown; spores hyaline. 



Duplex; upper layer forming upright tufts of stiff bristles; tubes small. 



Pogonomyces 

 Duplex; upper layer spongy; tubes large. Funalia 



Duplex; upper layer spongy; tubes small, sometimes lamellate. 



Coriolopsis 

 Context simple; light brown. 



At first fleshy, becoming slightly corky. Ischnoderma 



Tough from the first; surface encrusted. Antrodia 



Tough from the first; surface not encrusted, glabrous. 



Hapalopilus 

 Context simple; dark brown; context friable; often stipitate. 



Phaeolus 

 Context brown; spores brown. 



Sessile. Inonotus 



With central stipe; hymenium with setae. Polystidus 



With central stipe; hymenium lacking setae. Coltricia 



Hymenophore large, woody, perennial; mostly sessile but sometimes 

 stipitate. 



