Spore-layer consisting of a resupinate pore-layer 30 30. Pore-layer totally resupinate; flesh very poorly developed _Fibuloporia_ and related genera Fruit-body resupinate or developing ill-formed caps at the margin; flesh well-developed and quite tough _Datronia_, _Gloeoporus_ & _Bjerkandera_ 31. Fruit-body with a distinct stem 32 Fruit-body sessile or with a poorly developed stem, or if merely with a basal swelling then pores bruising 33 32. Pores dark-coloured but spores pale-coloured in mass _Coltricia_ (also see _Phaeolus_ below) Pores white or creamy, foot often darkened or black, and spores hyaline _Polyporus_ 33. Pores brightly coloured, red, lilaceous or orange to apricot-colour 34 Pores never as brightly coloured, cream, white, grey or in some shade of brown 35 34. Pores red to orange-red _Pycnoporus_ Pores lilac to violaceous, or lilaceous orange to apricot colour _Hapalopilus_ (orange-apricot) & _Hirschioporus_ (lilaceous) 35. Pore-surface brown or dark grey and spores often colourless 36 Pore-surface white or creamy, or yellow; spores hyaline 38 36. Pore-surface firm and grey _Bjerkandera_ Pore-surface greenish yellow, bruising brown or yellow-brown and darkening with age 37 37. Fruit-body lacking a stem, rust-brown, breaking easily, cheesy and with silky sheen _Inonotus_ Fruit-body with a broad basal hump, fibrillose spongy with yellow margin to cap _Phaeolus_ 38. Tubes forming a layer quite distinct from the flesh; fruit-body fleshy and tough 39 Tubes not forming a layer distinct from the flesh; fruit-body woody or corky 43 39. Pore-surface bright yellow; upper surface yellow or orange _Laetiporus_ Pore-surface white 40 40. Fruit-body medium to large, shell-shaped, whitish brown or silvery grey on top; on birch _Piptoporus_ Fruit-body often frond-like, infrequently shell-shaped and if on birch then small 41