Flesh poorly differentiated and fruit-body lacking a cap members of the Corticiaceae (including _Peniophora_ & _Hyphodontia_ p. 176) 17. Spores borne on teeth or spines 18 Spore-bearing layer lining tubes or elongate pores 22 18. Fruit-body with central stem; agaric-like but not attached to cones 19 Fruit-body encrusting or bracket-like, or with lateral stem if resembling an agaric 20 19. Fruit-body fleshy _Hydnum_ and related genera Fruit-body rubbery or tough _Hydnellum_ and related genera 20. Fruit-body growing attached to cones and cap with lateral stem _Auriscalpium_ Fruit-body not on cones and distinct stem lacking 21 21. Spores borne on a series of radially arranged knotches resembling gills _Lentinellus_ Spores borne on a resupinate layer of spines _Mycoacia_ and related genera 22. Tubes free one from another _Fistulina_ Tubes united to form a distinct tissue 23 23. Fruit-body perennial and exhibiting more than one layer of tubes 24 Fruit-body annual although the fruit-body can persist in a dried depauperate form for several months 27 24. Spores brown 25 Spores colourless 26 25. Large, brown, sterile cells present in the tubes; spores simple _Phellinus_ & _Cryptoderma_ Brown, sterile cells absent from tubes; spores complex _Ganoderma_ 26. Large woody fruit-body with crust-like top _Fomes_ Medium sized to small, fleshy-tough fruit-body with downy or crust-like top _Oxyporus_, _Fomitopsis_ & _Heterobasidion_ 27. Spores borne in labyrinth-like or elongate pores, or cap either poorly developed or absent, and only resupinate pore-surface present 28 Spores borne in distinct pores on well-developed woody fruit-bodies 31 28. Spores borne in labyrinth-like pores _Daedalea_ & _Daedaleopsis_ Spores borne in elongate pores like very thick gills, or fruit-body completely resupinate 29 29. Spore-layer lining elongate pores _Lenzites_ (white) & _Gloeophyllum_ (brown)