[=pulvinatus=, Pers. P. pulvinate, rather wavy, glabrous, whitish, disc tinged flesh-colour; g. decur. crowded, white; s. very short, solid, hard. **** _Veil absent; gills deeply decur.; pileus lateral, sessile or produced behind into a short stem-like base._ =ostreatus=, Jacq. Tufted. P. 7-15 cm. fleshy, shell-shaped, ascending, blackish then grey or pallid; g. rather distant, anastomosing behind, pallid; s. widening into p. very short, downy or strigose at base; sp. 10-12 x 4-5. Esculent. var. _euosmus_, B. Smell strong. Gills and spores tinged pink. var. _columbinus_, Q. P. dark bluish-grey. var. _nudipes_, Boud. S. quite glabrous. [=ambiguus=, Oud. Excentric. P. sessile or shortly stalked, shining, blackish or deep violet, edge incurved; g. deeply decur. anastomosing behind, lilac; s. firm, elastic, thickened upwards, base strigose. =revolutus=, Kickx. P. 9-15 cm. fleshy, firm, elastic, shining, depr. behind, smoky-yellow then grey, edge incurved; g. serrulate, white; s. 2-3 cm. short, thick, whitish; sp. ----. var. _anglicus_. Edge of p. not or very slightly incurved; g. pallid ochraceous. [=Staringii=, Oud. Excentric. P. lateral, produced at base into a short oblique stem, suborbicular or reniform, exp. very glabrous, smoky fuscous, centre paler; g. white, anastomosing behind. =salignus=, Pers. P. 4-9 cm. fleshy, spongy, becoming depr. behind and strigose, horizontal, yellow brown or dusky; g. somewhat branched, edge eroded, dingy; s. short, firm, tomentose; sp. 8-11 x 3-4. [=Saccardianus=, Arc. Subexcentric, usually sinuately lobed, even, glabrous, at length exp. and wavy, tan or grey; g. narrow, thin, crowded; s. striate, glabrous, grey or umber; sp. 6-5 x 3-4. [=roseocinereus=, Allesch. P. thin, campan. edge becoming split and striate, fibrously silky, rosy-grey; g. very broad, pallid flesh-red; s. shining white, fibrously striato-sulcate; sp. pale rufous, 5-7. =acerinus=, Fr. White. P. 3-8 cm. tough, circular, silky-villose; g. closely crowded, white then yellowish; s. subobsolete, downy; sp. ----. [=pathenopejus=, Comes. Large, caespitose. P. excentric, generally dimidiate, conchate, elliptical or rounded, mouse-grey then pale, viscid, squamulose; g. deeply decur. base anastomosing, white then tinged yellow; sp. 9-12 x 4-6. [=Gemmellari=, Inzeng. Large, sessile. P. lateral, convex then exp. yellowish, striate, upper stratum gelatinous; g. decur. broad, anastomosing behind, white then sulphur. B. DIMIDIATI. _P. definitely lateral, without a free margin behind; not resupinate at first._ [=geoginus=, D. C. P. erect, subinfundib. even, glabrous, edge wavy, reflexed, brownish; g. decur. crowded, white; s. very short, thick, tuberous. =petaloides=, Bull. P. 2-5 cm. thin, ascending, spathulate, entire, disc depr. brownish then pale; g. crowded, narrow, whitish; s. short, compressed, downy; sp. 9-10 x 4. _P. porrigens_ differs in being white and stemless.