=metata=, Fr. Smell weak, alkaline, soft. P. obt. striate, hygr. grey--rarely yellowish or pinkish--even, opaque, and whitish when dry; g. adnate, not connected by veins, whitish; s. 4-7 cm. firm, even, glabrous, base fibrillose; sp. ----. =cinerea=, Mass. and Crossl. Entirely grey, smell strong, like radishes. P. 1.5-2 cm. subgibbous, exp. pale, silky and even when dry; g. adnate; s. 5-7 cm. glabrous, downy and white at base; sp. 8 x 5; cystidia fusiform. _M. leptocephala_ differs in sulcate p., and _M. metata_ in white gills. _M. plumbea_ has no smell. =plicosa=, Fr. 1.5-2.5 cm. exp. plicato-sulcate, greyish brown, opaque when dry; g. thick, distant, veined, grey; s. 3-4 cm. polished, greyish; sp. globose, 4-5. [=subplicosa=, Karst. P. campan. obtuse, with distant grooves, almost plicate, glabrous, grey then pallid; g. adnate, whitish; s. rigid, shining, hyaline or livid, base strigose not rooting; sp. 6-8 x 3-5. =consimilis=, Cke. P. 1.5-2.5 cm. camp. grey, umbo darker, striate to middle, margin upturned and splitting; g. adnexed, grey; s. 2.5-3.5 cm. dry, smooth, paler than p.; sp. ----. More or less resembling several species. _M. leptocephala_ and _M. metata_ differ in strong smell. _M. peltata_ in orbicular plane pileus. _M. rugosa_ differs in rugose pileus. =peltata=, Fr. P. 1.5-2 cm. orbicular, soon plane, disc fleshy, blackish brown then grey, margin striate; g. with decurrent tooth, grey; s. 3-4 cm. even, glabrous, base downy; sp. ----. Differs from _M. pelliculosa_ in absence of viscid pellicle. =aetites=, Fr. P. 1.5-2 cm. camp.-convex, coarsely striate, hygr. broad obtuse umbo prominent, brownish; g. uncinate, thin, connected by veins; s. 4-5 cm. glabrous, shining subcompressed; sp. ----. =stannea=, Fr. P. 2-3 cm. exp. hygr. grey, even, and tin colour with a silky sheen when dry; g. with decurrent tooth, connected by veins, greyish white; s. 5-7 cm. even, shining, often compressed; sp. ----. Differs from _M. vitrea_ in decurrent tooth to gills. =vitrea=, Fr. P. 1.5-2.5 cm. livid brown, finely striate all over, no trace of umbo or fleshy disc; g. adnate, not connected by veins; s. 6-9 cm. slightly striate, polished, pale, base fibrillose; sp. ----. Differs from _M. aetites_ and _M. stanneus_ in gills not having a decurrent tooth and not connected by veins. =tenuis=, Bolton. White, tufted. P. 1-1.5 cm. brittle, camp. obtuse, then exp. striate; g. adnate; s. 5-7 cm. thin, pellucid, glabrous; sp. ----. _M. gypsea_ differs in decurrent tooth of gills, and strigose base of stem. V. FILIPEDES. _Stem very slender, flaccid, rooting, dry, juiceless. Gills discoloured, edge paler._ =filopes=, Bull. P. 1-1.5 cm. camp. then exp. striate, livid grey; g. free, white; s. 6-8 cm. flaccid, glabrous, rooting, base downy; sp. ----.