fragile when dry. Pileus firm,flexible or rigid; Context duplex,spongy above Pileus more than 1 cm. thick;tubes large,1-2 per mm.;dark not resi- nous. Pileus less than 1 cm. small Pileus 5 cm. or less broad Pileus 4-7 cm. broad;surface very hairy. Context not duplex Pileus fleshy,tough to woody & rigid Surface anoderm,rarely zonate Hymenium smoke-colored, when young,becoming black Tubes white;mouths black Palbostygia (Bjerkandera) Hymenium pallid,becoming blackish. P.Cuba Pileus 5 cm. more or less Pterebrans Pileus 10-20 cm. Mymenium white or palllid Context fleshy-tough, friable when dry. Pileus 8 cm. or more diam. Tubes less than 5 cm.; pileus 3-5 mm. thick Tubes firm,entire T.palmarum. Tubes more than 5 cm. ± long;surface smooth; pileus white;spores ellipsoidal T.nivosellus. Pileus under 5 cm. Pileus resinous or cartilaginous3-4 cm. thick;tubes 6 per mm.T. versicutus. Pileus not resinous, etc. Pileus milk-white, unchanging,very soft & friable T.leucomallus Pileus somewhat brownish,nöt very friable. Tubes 3-4 mm. long, longer than thick- ness of thin con- text. T.albogilvus. Tubes short=thick- ness of context. P.(Tomophagus)colossus Fr. Spongipellis S.luridesccens. S.hydrophilus S.substuppeus. Tyromyces. P.subsimulans.