Pileus isabelline to fulvous Coriolopsis Pores inconspicuous;pileus papery-thin, very soft and flexible Pi Pores conspicuous Hymenium isabelline;pileus thick and firm C. crocata C. occidentalis Hymenium whitish or grayish,at least until maturity pileus thin,1-3 mm,flexible often narrowly re- flexed or wholly resupinate Surface and hymenium whitish to isabelline C. rigida Surface isabelline to fulvous or whitish cinereous hymenium murinuous to umbrinous C. fulvocinerea Pileus wholly or partly darker than tawny, usually bay-brown or blackish Context isabelline Surface finely tomentose to scabrous C. Taylori Surface densely clothed with long cirriform hairs C. cirrifer Context umbrinous-chestnut Pileus effused, narrowly reflexed Tubes large, 2 per mm, cinereous C. vittata Tubes small, 7-8 per mm, purplish umbrinous C. vibratilis Pileus not effused, or if so broadly reflexed Surface entirely pure black, or slightly fuliginous in narrow zones;hymenium grayish white C. nigrocinerea Surface fulvous umbrinous with bay-black zones, or uniformly dark bay Pileus flexible,tomentose to aculeate C. caperata Pileus rigid,tomentose to glabrous, tubes often stratified C. subglabrescens Tubes large and irregular .Funalia Context very thin 1-2 mm Surface villose,with simple hairs;hymenium pale rose when fresh F. villosa. Surface strigose,with branched hairs; hymenium pallid to brov brown F. cladotricha Context usually quite thick, 3-15 mm Surface hispid F. hispidula Sürface villose or hirsute F. stuppea Surface aculeate F. aculeifer Context dark brown Context duplex, mostly of intricately woven black hairs Trichaptum trichomallum Context simple, tough Tubes yellow Flaviporus crocitinctus Tubes black Nigroporus vinosus Tubes brown,rarely greenish Tubes soon splitting into teeth Cerrenella Pileus 1 mm or less thick, hymenium olivaceous becoming ashy C. farinacea. Pileus 3-7 mm thick,hymenium chestnut to almost black C. subcoriacea Tubes entire