Pileus applanate dimidiate, light weight, soft woody texture Pyropolypos yucatanensis Pileus ungu late, conic, pendent, vertically attached, heavy stony texture P. dependens Pileus thin or moderate, conchate to applanate, never truly ungu late Context ferruginous to tawny Surface soon covered with horny thick, dark glabrous crust Tube layers very prominent, tubes stuffed with white mycelium P. grenadensis Tube layers distinct but not prominent, not conspicuously stuffed Dissepiments thick, hymenium concolor with context, surface not rimose in age F. pseudoserex Dissepiments thin, hymenium at length darker than context, surface rimose P. jamaicensis Surface anoderm or slightly encrusted Hymenium chestnut brown, glistening, tubes 3-5 mm long each season, pileus large velvety ferruginous to tawny P. Robinsoniae Hymenium isabelline to tawny Pileus turbine - conic, attached at vertex, spores ovoid, hyaline 6-7x4-5u, cystidia none F. Baccharidis Pileus dimidiate to flabelliform, normally attached Surface tomentose, soft to tough, tubes short, tawny within Tubes 5-6 per mm. corky to woody with a silky lustre P. linteus Tubes 8-10 per mm., pileus 4-8 cm broad, [illegible] concave below, surface remaining conspicuously tomen- tose P. subpectinatus Surface soon encrusted hard; tubes avellaneous within, 4-6 mm long each season F. calcitratus Context yellow (flavus to luteus) Surface conspicuously fibrose lacerate P. sarcitus Surface inconspicuously tomentose or glabrous Pileus very large 15-30 cm broad; context marked with interlacing lines of lighter color F. extensus Pileus 8-12 cm broad; context homogeneous Surface almost free from markings; tubes 2-6 mm long each season; on mesquite F. sublinteus Surface distinctly zonate and shallowly furrowed; tubes 5-10 mm long each season; on logwood F. Haematoxyli Surface encrusted; context punky, sessile, simple or imbricate Context ferruginous; spores hyaline; pileus compressed ungu late; pores 5 per mm. Elvingia fasciata Context tawny to bay; spores yellowish brown, pileus usually applanate crust brown. Pileus thick at maturity, crust smooth and very hard; hymenium plane margin truncate, very smooth often laccate E. tornata Pileus thin, crust radially wrinkled, thinner; hymenium concave; mar- gin undulate, never laccate E. Lionnetii