Among moss and grass. The only known _Mycena_ with a furfuraceous pileus. =luteoalba=, Bolton. P. 1-2 cm. campan. then exp. and umb. pale yellow; g. adnate, broad, white; s. 3-5 cm. shining, glabrous, yellowish; sp. ----. =flavoalba=, Fr. P. 1-5 cm. exp. umb. often cracked at margin, yellowish or white; g. soon free, distant; s. 2-3 cm. white, pellucid, apex pruinose; sp. 6-8 x 3-4. _M. lactea_ differs in adnate gills and downy base of stem. _M. luteoalba_ has a yellowish stem. =lactea=, Pers. White. P. 1-1.5 cm. subumb. striate, even when dry; g. adnate, narrow, crowded; s. 3-5 cm. toughish, not quite straight, glabrous; sp. 7-8 x 3-4. Differs from _M. gypsea_ and _M. tenuis_ in scattered habit. var. _pithya_, Fr. Smaller, p. becoming almost plane; s. thin, base bubillose, downy. forma _pulchella_, Fr. Milk-white; g. linear, ascending; s. attenuated. Solitary. [=olida=, Bres. Smell very strong, rancid. P. thin, conico-campan. obtuse, then exp. and umb. yellow soon pale straw; g. uncinato-decur. connected by veins, white; s. hyaline, strigosely rooting; sp. 8-9 x 6. =gypsea=, Fr. Caespitose. Pure white, rarely with a yellow tinge. P. 1-2 cm. conical then campan. striate up to umbo, glabrous; g. subuncinate; s. 5-7 cm. straight, narrowed upwards from hairy base; sp. 8-9 x 4. [=nivea=, Q. Shining white. P. sulcate, diaphanous; g. uncinate; s. pruinose, base rather swollen, fibrillose. [=galeropsis=, Fr. P. conico-camp. even, gilvous; g. free, whitish; s. straight, narrowed upwards, fragile, not rooting, ferruginous below. [=nucida=, Brig. P. campan. obtuse, even, downy under a lens, deep rust-colour, hygr.; g. free, white then rosy; s. silky shining, base snow-white, apex mealy. [=Benzonii=, Fr. P. very thin, campan. exp. umbil. finely striate, pallid or reddish; g. white; s. equal, glabrous, white. An introduced species. [=melanops=, West. P. convexo-camp. plicate, umbo blackish-brown; g. adnexed to a collar; s. slender, glabrous base fibrillose. [=pruinatus=, Fr. Shining white. P. thin, conico-campan. papillate, edge deflexed, sulcate, pruinose; g. crowded; s. bulbous, naked. III. RIGIDIPEDES. _Stem firm, rigid, rather tough, juiceless, base strigosely rooting, gills discoloured, grey, reddish, &c., often connected by veins._ =cohaerens=, Fr. P. 2-3 cm. camp. obtuse, tawny cinnamon, soft and velvety; g. free, distant, very broad, pallid; s. 8-12 cm. horny, rigid, even, shining, bay, base downy, rooting; sp. 10 x 7-8. [=raeborhiza=, Lasch. P. acute camp. exp. glabrous, striate, rather tawny then pale; g. almost free, connected by veins; s. even, floccosely pruinose, rooting, tinged tawny. =prolifera=, Sow. Caespitose. P. 1-2 cm. camp. then exp. subumb., margin coarsely striate, yellowish tan; g. adnexed; s. 6-8 cm. glabrous, shining, striate, brownish below, rooting; sp. ----.