518 CLASS BASIDIOMYCETEAE 



Pores breaking down to form flat teeth with denticulate margin. 



Echinodontium 

 Not forming denticulate teeth. 



Context wood-colored or pale brown. Fomes 



Context white or light-colored. Fomitopsis 



Context brown; surface not encrusted. Phellimis 



(Pyropolyporus) 

 Context brown; surface encrusted; several pilei massed together. 



Globifomes 

 Walls of pores breaking down to form concentric lamellae. 



Cyclomyces 

 Pore walls breaking down to form radiating lamellae or labyrinthiform 

 passages. 

 Context brown. Gloeophyllum 



Context light-colored. 



Hymenophore lamellate; woolly and zonate above. Lenzites 

 Hymenophore typically labyrinthiform, but sometimes broadly lamel- 

 late; glabrous but rough above. Daedalea 

 Like Daedalea but the labyrinthiform tubes small, with thin walls, 

 becoming lamellate with age.^ Daedaleopsis 



In the more conservative classifications the genera included in this Key to the 

 Polyporaceae are left united into a much smaller number of large, polymorphous 

 genera, as follows: 



Poria includes also Podoporia, Hydnochaete, Melanoporia, Fomitoporia, Physi- 



porus. 

 Polyporus includes also Abortiporus, Bjerkandera, Boletopsis, Cryptoporus, 



Grifola, Hapalopilus, Inonotus, Ischnoderma, Laetiporus, Phaeolus, Pipto- 



porus, Porodisculus, Pycnoporus, Scutiger, Spongipellis. 

 Polystictus is sometimes included in Polyporus; if maintained as a distinct genus 



it may include also Coriolus, Coriolellus, Coriolopsis, Coltricia, Funalia, 



Hirschioporus, Poronidulus. 

 Trametes includes also Antrodia, Pogonomyces, and species out of some of the 



foregoing genera grouped in Polyporus and Polystictus. 

 Daedalea includes also Daedaleopsis. 

 Lenzites includes also Gloeophyllum. 

 Irpex and Echinodontium are included in Family Hydnaceae. 



Key to the Subfamilies and More Important Genera of Family Boletaceae^ 



(Based partly on Snell, 194-1 and 1942, and Singer, 1945-194?) 



Tubes adhering to one another even to maturity although usually easily separable 

 mechanically. 

 Spores mostly dark and ornamented with warts, spines, reticulations, or longi- 

 tudinal ridges, sometimes smooth spores present on the same hyme- 



^ See also Coriolopsis trabea (Pers.) B. & S., whose pores are often lamellate. 



7 Gilbert (1931) and Singer (1945-47) divide these genera among two families: 

 Strobilomycetaceae, including Strobilomyces, Boletellus, and Porphyrellus; and Bole- 

 taceae, including all the other genera. Coker and Beers (1943) recognize only one 

 family and three genera: Boletus, Boletinus, and Strobilomyces. 



