[=lasiosperma=, Bres. Caespitose. P. thin, conico-campan. exp. umb. edge then upturned, rather viscid, striate to umbo, livid grey with a grey bloom at first; g. sinuato-unc. connected by veins, whitish then grey; s. pallid above, chestnut and white-pruinose below; sp. globose, aculeate, 6-7. IV. FRAGILIPEDES. _Stem fragile, dry, juiceless. Pileus hygrophanous. Gills often discoloured._ =atroalba=, Bolton. P. 2-3 cm. campan. obtuse, disc blackish or fuscous, whitish towards striate margin; g. free, crowded, glaucous; s. 6-10 cm. pallid, apex darker, base swollen, strigose; sp. ----. =dissiliens=, Fr. Smell strong, very fragile, conico-camp. obtuse, greyish-brown then pale, grooved to middle; g. broadest in front, base tinged grey; s. 4-5 cm. subincurved, slightly striate, dusky grey, base strigose; sp. ----. When compressed the stem splits into pieces which curl outwards elastically. =atrocyanea=, Batsch. P. 1-1.5 cm. convex-camp. sulcate, dark brown then blue-grey, powdered with white meal, deformed umbo obtuse; g. adnexed, whitish; s. 3-4 cm. slender, glabrous, blackish-blue; sp. ----. =pullata=, B. and Cke. Smell slightly nitrous. P. 1.5-2 cm. dark brown, disc blackish, obtusely umb. striate to middle; g. white; s. 5-6 cm. coloured like pileus, rooting; sp. 6 x 3. _M. leucogala_ and _M. galopoda_ differ in white milk in stem. _M. atrocyanea_ differs in dark blue tinge of p. and s. [=cinerella=, Karst. Smell very strong of meal. P. campan. entirely striate, grey or greyish-pallid; g. broadly adnato-decur. greyish-white; s. greyish-white, base fibrillose, not rooting; sp. ----. =psammicola=, B. and Br. Smell strong. P. 4-6 mm. hemispherical, brown, paler towards striate margin, sprinkled with minute particles; g. adnexed, sinuate; s. 1.5-2 cm. umber, paler upwards, everywhere pulverulent; sp. ----. Differs from _M. paupercula_ in pulverulent stem and pileus. =paupercula=, B. Smell strong. P. 2-4 mm. conical, exp. pale ochraceous, minutely fibrillose; g. free, whitish; s. 1-1.5 cm. slender, whitish, rooting; sp. ----. =leptocephala=, Pers. Smell strong, solitary, entirely grey. P. 2-2.5 cm. umb. sulcate, pruinose, opaque; g. emarginate; s. 4-5 cm. slightly striate, opaque, dry; sp. ----. =alcalina=, Fr. Smell strong. P. 1.5-2.5 cm. camp. obtuse, naked, deeply striate when moist, shining when dry, pallid or tinged yellowish-green; g. adnate; s. 4-7 cm. yellowish, viscid, glabrous, shining, base villose; sp. 8 x 5. =ammoniaca=, Fr. Smell strong. P. 1.5-2 cm. conico-exp. umb. naked, discoid, opaque, dark brown or greyish, striate at paler margin; g. adnate; s. even, glabrous, rooting, pallid, 4-5 cm.; sp. ----. _M. alcalina_ differs in tufted habit, viscid stem with yellow tinge of colour.