[=gracilis=, Q. Snow-white. P. apiculate, striato-sulcate, glabrous; g. arcuate, distant; s. filiform, pellucid, pruinose, base downy, rooting; sp. 8 x 2. [=candida=, Bres. Shining white. P. thin, convex, exp. often papillate, glabrous, pellucidly striate; g. deeply decur. connected by veins at base; s. splitting into fibres, glabrous, base rooting, strigose; sp. 9-11 x 4.5-5. =bullula=, Brig. White. P. 3-4 mm. even, hemisph. diaphanous; g. arched, decur.; s. 2 cm. filiform. ** _Gills fold-like, narrow._ =integrella=, Pers. White. P. 3-7 mm. hemisph. then exp. pellucid-striate; g. equal, fold-like, distant, rather branched; s. very slender, pubescent; sp. 6-7 x 4. [=microscopica=, Wirt. Minute, diaphanous. P. 3-4 mm. infundib. 4-6, sulcate; g. very narrow, arcuate; s. capillary. =polyadelphus=, Lasch. Pure white. P. 2-3 mm. coarsely striate and minutely flocculose; g. decurrent; s. 1-2 cm. very slender, base downy; sp. 5 x 2.5. [=cuspidata=, Q. Hyaline white. P. very acuminate, striate, flocculose; g. decur. branched; s. filiform, pulverulent, the slight bulb hairy; sp. 8 long. [=crispula=, Q. White, diaphanous. P. crisped, pruinose; g. wrinkled, very thin; s. short, filiform, pruinose; sp. 8 long. [=gibba=, Pat. (= _Cyphella infundibuliformis_, Fr.). White, minute. P. trumpet-shaped, gibbous then deeply infundib. downy; g. mere traces of folds; s. slender, downy. PLEUROTUS, Fr. A. EXCENTRICI. _Pileus entire, extended laterally, excentric but not truly lateral._ * _Veil forming a ring on the stem._ =corticatus=, Fr. P. 8-18 cm. convex then exp. covered with dense greyish down then floccosely squamulose; g. decur. white, anastomosing behind; tinged yellow when old; s. 3-7 cm. subexc. rooting, ring torn; s. 9-14 x 4-6. [=Albertinii=, Fr. P. convex, dimidiate, sooty, with black squamules; g. decur. distinct, white; s. with black squamules up to sooty ring. =dryinus=, Pers. P. 5-9 cm. oblique or subcircular, hard, whitish with brownish spot-like squamules, flesh white then yellowish; g. decur. not anastomosing behind, white tinged yellow; s. 2-3 cm. sublateral, ring fugacious, torn; sp. 10 x 4. Differs from _P. corticatus_ in gills not anastomosing behind. =spongiosus=, Fr. P. 5-8 cm. spongy, pulvinate, greyish tomentose; g. sinuato-adnexed, white, simple; s. 1-3 cm. tomentose, white, ring white, soon torn; sp. 8-10 x 4. [=calyptratus=, Lindbl. P. soft, lateral-dimidiate, horizontal, reniform, glabrous, viscid, sooty or livid; g. adnate to a nodule, crowded, white then yellowish; s. a downy nodule, viscid membranous ring torn. ** _Gills sinuate or obtusely adnate._ =ulmarius=, Bull. P. 8-15 cm. convex then plane, glabrous, livid then pale, spotted; g. adnexed, broad, whitish; s. 1-3 cm. base thickened, tomentose; sp. 5-6, glob.