=piperatus=, Fr. White. P. 7-18 cm. thick, firm, umbil. then infundib. edge erect, glabrous, even; g. decur. crowded, narrow, forked; s. 3-4 cm. stout, smooth, solid; milk copious, white, acrid; sp. 8-9. =pergamenus=, Fr. White. P. 5-8 cm. plane then depr. wavy, rugulose; g. adnate, very narrow, horizontal, tinged straw colour; s. glabrous, discoloured, 7-10 cm.; milk white; sp. 8 x 6. Differs from _L. piperatus_ in crowded narrow gills, longer stem, and thinner pileus. =Scoticus=, B. and Br. Pallid white, smell pungent. P. 2.4 cm. soon plane, tomentose then smooth except incurved margin; g. thin, rather broad; s. 2-3 cm. solid, tinged pink; milk white; sp. 7-8. =involutus=, Soppitt. White. P. 2-4 cm. plane or depr. incurved edge silky; g. subdecurrent, very narrow, densely crowded; s. 2-2.5 cm. glabrous, solid; milk white; sp. elliptical, 5 x 3. Differs from _L. scoticus_ and all known species in the smooth, elliptical spores. =torminosus=, Schaeff. P. 6-9 cm. obt. depr. slightly zoned, margin strongly involute and shaggy, tinged flesh colour or ochre; g. subdecur. pale; s. 5-8 cm. paler than p.; milk white; sp. echin. 9-10 x 7-8. Differs from _L. cilicioides_ in zoned pileus and white milk. =cilicioides=, Fr. P. 5-9 cm. soft, not zoned, exp. and depr. margin fibrillose, pale flesh colour with rufous tinge; g. decur. somewhat branched; s. 5-8 cm. stuffed, even, silky, not spotted, pallid; milk white or faintly tinged yellow; sp. 8 x 6-7, echinulate. =pubescens=, Fr. P. 5-8 cm. thin, exp. umbil. zoneless, whitish, margin pubescent; g. crowded, tinged pink; s. 2-4 cm. pinkish then pale, narrowed downwards; milk white; sp. echin. 7-8. Differs from _L. torminosus_ and _L. cilicioides_ in the margin being only downy. =insulsus=, Fr. P. 6-9 cm. soon infundib. viscid, slightly zoned, yellowish or reddish, margin naked; g. forked, pallid; s. 3-4 cm. stuffed then hollow, pallid; milk white; sp. echin. 10 x 8. _L. zonarius_ differs in the solid stem. =hysginus=, Fr. P. 6-10 cm. rigid, umbil. viscid, thin margin incurved, reddish flesh colour; g. crowded; s. 5-9 cm. stuffed then hollow; milk white; sp. 10 x 7-8. [=luridus=, Fr. P. fleshy, almost plane, even, viscid, slightly zoned, rufous-grey, edge bent down; g. decur. whitish; milk white, acrid; s. hollow, pallid; sp. 8 x 6. =zonarius=, Fr. P. 5-9 cm. compact, viscid, pale orange or yellowish, zoned; g. whitish; s. 5-8 cm. solid, yellowish; milk white; sp. 9-10 x 8. =circellatus=, Fr. P. 5-9 cm. soon plane, wavy, viscid, brownish, zones and umbilicate disc darker; g. crowded, whitish; s. solid, narrowed below, pallid; milk white; sp. 7-8. _L. flexuosus_ differs in yellow gills. =trivialis=, Fr. 9-18 cm. depr. viscid, zoneless, pale yellowish or pinky tan, margin incurved; g. crowded, white; s. 3-8 cm. paler than p., hollow; milk white; sp. 9-10.