Stipe less than 5 cm long Pileus 10 cm or more broad; tubes 5 to a mm; plants cespitose A. coffeatum Pileus 5 cm or less broad; tubes 8 per mm, plants simple A. regulicolor A. avellaneum Stipe 15 cm. long Stipe central, erect Hymenium white to avellaneous; stipe 15 cm long A. chapieri Hymenium rich yellow; stipe less than 10 cm long A. flaviporum Pileus 3 cm or less broad; stipe slender, less than 5 mm thick A. renatum Context bay Context white to avellaneous Stipe 2 cm long; pileus orbicular, nodding A. nutans Stipe 10 cm. long; pileus reniform, erect A. subrenatum Hymenophore sessile Context olivaceous Tubes 5 per mm, 1-3 mm long each season Fomitella F. supina Tubes 1-2 per mm. 3-5 mm long each season F. fumosoavellanea Context flesh or wood colored, tubes 3-5 mm each season, spores spheric Fomes Sagræanus Fomes Context white or nearly so (yellowish) Pileus encrusted, more than 3 cm, surface pure black or nearly so at maturity with no trace of red Context punky, crust thin, fading in age F. subferreus Context woody, crust thick, horny and shining F. ligneus Pileus not encrusted, surface concolor with context Pores large, 2 per mm, reddish when bruised, , annual strata separated by thick layers of context F. rubritinctus Pores small, 5-7 per mm, not changing, tubes light brown, strongly contrasted with yellow or white context, 1 cm or more long F. Auberianus F. geotropus Pyropolyporus Surface zonate Surface azonate Context brown or latericeous Pileus thick, ungulate, context light to dark brown Surface brown or black or gray, not becoming rimose hymenium roseocinereous to smoky gray F. roseocinèreus Hymenium ferruginous to tawny Context ferruginous, surface dark brown marked with narrow concentric lines; tubes thinwalled, 5 per mm P. inflexibilis Context tawny, surface black without lines and more sulcate, tubes thi@walled, 7 per mm. P. Calkinsi Surface black or nearly so, soon very rimose, all brown spores Pileus 12 cm or more margin rounded P. Cedrelae Pileus smaller, margins angular Tubes large 3-4 per mm, thinwalled, spores 7x9u, cystidia none P. Underwoodii Tubes 5-7 perm. thickwalled