516 CLASS BASIDIOMYCETEAE 



Key to the More Important Genera of Family Polyporaceae 



Always resupinate; annual (except Fomitoporia); with thin- walled, not truncate 



spores; without setae, but sometimes with cystidia (see also 

 some resupinate species or specimens of Gloeoporus, Hap- 

 alopilus, Tyromyces, Coriolus, Coriolellus, etc. which are 

 mainly more or less pileate).^ 

 Context white or light-colored, not becoming brown. 



Not becoming brighter on being bruised or with age. Poria 



Becoming some bright color on being bruised or with age. Podoporia 

 Context brown or black. 



Strongly irpiciform or hydnoid; at the margin with remains of tubes. 



Hydnochaete 

 Definitely porose. 



Fructification black. Melanoporia 



Fructification brown, spores hyaline; perennial. Fomitoporia 



Fructifications brown, spores brown. Physiporus 



Usually pileate; stalked or sessile; reflexed-effuse; under some conditions some- 

 times resupinate. 

 Spores truncate at the apical end, two-layered, the epispore smooth and the 

 endospore with spines or other types of projections into the 

 epispore; sessile or stipitate; upper surface with a hard, often 

 laccate, crust. Ganoderma 



Spores not as above. 



Volva-like structure present. Cryptoporus 



Volva-like structure wanting. 



Hymenophore definitely porose, in a few species the pores breaking up into 

 flattened tooth-like plates; annual. 

 Context white or light-colored, not pronounced brown. 

 Fleshy or tough; stipitate; context homogeneous. 



Stipe much branched, at the bases or near trees. Grifola 



{Polypilvs) 

 Stipe simple; pileus fleshy; terrestrial. 



Spores strongly warted, light brown. Boletopsis 



Spores smooth, hyaline. Scutiger 



(Albatrellus) 

 Stipe simple; pileus fleshy to tough; large to medium size; growing 

 on wood or from a sclerotium; stipe central, eccentric or 

 lateral; pores round or radially somewhat elongated. 



Polyporus 

 (including Melanopus and Leucoporus) 

 Stipe curved, attached at the top of the minute turbinate hymeno- 

 phore; emerging from the lenticels of dead twigs; pores 

 round, small. Porodisculus 



Stipe lateral, very short, attached at the top of a large hoof-shaped 

 to bell-shaped hymenophore which has a thin, separable 

 pelHcle; on dead trunks of Betula, pores round, small. 



Piptoporus 



^ Based on Cooke, 1940. In addition, Bondarzew and Singer (1941) recognize | 



several other genera of resupinate Polyporaceae, distinguished by entirely different ' 



characters than shown here. Murrill's (1907) genera differ also in some ways. 



