Surface heavily bearded Surface not bearded Spores brown Hymenophore thin, dry, multizonate Hymenophore thin, fibrous, to spongy or corky Sporophore minute, 2 mm, erumpent from lenticels I. pusillus Sporophore 5-10 cm Surface conspicuously hairy Pileus thin, 1-2 mm Pileus thick, 7-20 mm Surface not conspicuously hairy Spores deep brown, not zonate; glabrous, hymenium fulvous, tubes 1 cm. Spores faint brown Pores invisible to naked eye Pileus thick, azonate, margin obtuse, hymenium dull I. corrosus Pileus thin, zonate, margin very sharp, hymenium glistening I. Wilsoni Pores visible to naked yey, sometimes small, hymenium plane, margin blunt, not depressed, surface soft and spoggy I. fruticum FOMITEAE Surface of hymenophore covered with reddish brown varnish, context punky or corky Sporophore stipitate, rarely varying to sessile Stipe very long and slender 10-15 cm. G. praelongum Stipe short to medium Surface of pileus narrowly multizonate Pileus and stipe chestnut, context isabelline G. perzonatum Pileus and stipe almost black; context dark tawny G. subfornicatum Surface of pileus not narrowly multizonate altho more or less sulcate Pileus very large 20-50 cm G. pulverulentum Pileus not more than 10 cm Context soon indurate, very hard, margin of pileus usually lobed G. stipitatum Context soft and punky, margin not lobed Surface shining, yellowish red to bay or dark brown, tubes 3-5 mm long G. subincrustatum Surface not shining, avellaneous to dull castaneous; tubes 5-10m long G. argillaceum Sporophore sessile, never truly stipitate Pileus less than 3 cm broad G. parvulum Pileus 8-80 cm broad Surface scaly and glistening like mica from excess of resin; hymenium white when young G. nitidum Surface normally laccate, tuberculose; hymenium cream colored when young G. tuberulosum Surface o hymenophore not varnished Hymenophore stipitate Amauroderma Pileus over 3 cm broad; stipe over 5 mm thick Stipe lateral, ascending. 3%6