Differs from _C. albus_ by glabrous s.

++ _Gills free._

=picaceus=, Fr. P. campan. glutinous, striate up to disc, blackish with white patches; g. free; s. 10-15 cm. white, hollow, base swollen; sp. 14 8.

=tomentosus=, Fr. P. cylindr. then narrowly conical, at length exp. 2-3 cm.; pallid yellow, covered with a greyish felt which breaks into scales; g. free; s. 5 cm. hollow, greyish, velvety; sp. ----.

[=velatus=, Q. P. cylind. then exp. 2-3 cm. yellowish, sulcate, veil white, thin; g. free but close to s.; s. 4-6 cm. white, villose, coa.r.s.ely striate; sp. 10 5.

[=Forquignoni=, Ma.s.s. (_C. Queletii_, Forq.). P. conico-campan. veil thick, ochraceous, then broken up into persistent patches, whitish, 5-6 cm. high; g. remote; s. white, floccosely fibrillose, ending in a tawny bulb; sp. 9 6.

[=varicus=, Fr. P. white or livid towards the split edge, with patches of white veil; g. free; s. 6-9 cm. often incurved, white, glabrous, solid, tough.

Differs from _C. picaceus_ in white p. and solid s.

** _Veil breaking up into superficial scales, cottony or fibrillose._

+ _Gills attached to stem._

-- _Pileus white or grey._

=niveus=, Fr. All pure white. P. 1-2.5 cm. campan. floccose; g. slightly adnexed; s. 5-8 cm. hollow, villose; sp. 16 11-13.

var. _astroideus_, Fr. P. squamose, naked, grey, 1 cm.; s. up to 8 cm.

slender, glabrous.

[=albus=, Q. Snow white. P. ovoid then exp. 1.5-2 cm. floccosely mealy then pearl grey and grooved, with tawny flecks at disc; g. adnate, seceding; s. coa.r.s.ely striate upwards; sp. 12-13 long.

[=Rostrupia.n.u.s=, Hansen. White. P. thin campan. then exp. tomentose, squamulose; g. free, grey then blackish; s. narrowed upwards, glabrous above, downy below, base with white tomentum.

Medium sized, allied to _C. niveus_.

[=pilosus=, Beck. P. cylindr. apex rounded, white, densely covered with septate acute white hairs, then exp. and centre almost glabrous and yellowish, edge slightly striate; s. slender, p.u.b.escent, base floccose; sp. 9-12 6-7.

=exstinctorius=, Fr. P. 3-5 cm. across, campan. whitish, apex tinged brown, at first with evanescent floccose scales; g. reaching stem; s.

8-12 cm. smooth, white, hollow, swollen at base and rooting; sp. 10-11 6-7.

Differs from _C. fimetarius_ in pileus becoming bald from disc to margin.

[=roris=, Q. P. soon convex and centre depr. pearl grey, transparent, covered at first with a thin tawny-white veil, 1-1.5 cm.; g. adnate; s.

3-4 cm. greyish, villosely floccose; sp. 11-12 long.

Differs from _C. plicatilis_ in adnate g. and from _C. diapha.n.u.s_ in villose stem.

=similis=, B. and Br. P. ovate then campan. pallid disc darker, striate, studded with brown tipped pointed warts, 2.5 cm.; g. adnate; s. white, hollow.

[=Brunandi=, Q. P. campan. 5-6 mm. high, very delicate, striate, greyish lilac, at first with crystalline interwoven filaments; g. adnate then free; s. white, floccose, bulbous; sp. 10 long.

Allied to _C. lagopus_.

---- _Pileus tawny or brownish._

=domesticus=, Fr. P. campan. obtuse, sulcate, disc even, bay, rest paler, scurfy-floccose, 4-7 cm.; g. adnexed; s. 6-9 cm. white, silky; sp. 11-12 7.

[=alopecia=, Fr. P. 6-7.5 cm. campan. obtuse, sulcate, pale brown or ochre, at first with adpr. fibrils; g. adnexed; s. 9-12 cm. densely scaly, hollow.

[=Boudieri=, Q. P. 1-2 cm. campan. coa.r.s.ely striate, pale tawny apex darker, covered with fine white down; g. adnate; s. 3-4 cm. white, pruinose and p.u.b.escent; sp. angularly globose, 10-12.

[=subcoeruleo-griseus=, Schulzer. P. acutely conical then plane, slightly striate, disc pale yellowish-pink, rest greyish blue, with minute fugacious scales; g. adnexed; s. white, floccosely pruinose, then glabrous, hollow; sp. 10-13 6-8.

++ _Gills free._

-- _Stem glabrous._

=nycthemerus=, Fr. P. conico-cylindr. then exp. 1.5-2 cm. plicate, ribs forked near edge, mealy then naked, grey, disc tawny; g. free; s. 5-7 cm. white, glabrous, flaccid, hollow; sp. ----.

[=gonophyllus=, Q. P. 1.5 cm. hemisph. striate, blackish grey, shining, veil floccose, whitish, soon disappearing; g. free, triangular, edge serrate; s. 3 cm. glabrous, slightly striate, white; sp. 10 4.

=Spraguei=, B. and Curt. P. conical then campan. 1.5-2 cm. tomentose, striate, greyish, disc tawny; g. few, distant; s. 3-5 cm. pale reddish ochre; sp. 10 5.

=Spegazzinii=, Karst. P. cylindr. or oval, then exp. and splitting up to disc, greyish, soon naked and grooved; g. free; s. white, hollow, thickened below and rooting; sp. 9-14 5-6.

=platypus=, B. and Cke. P. white then yellowish, flocculose, 4-5 mm.; g.

free; s. 1.5-3 cm. base discoid; sp. 8 6.

---- _Stem floccose or pulverulent at first._

=narcoticus=, Fr. Foetid. P. cylindric-clavate then exp. 1.5-2 cm.

hyaline, striate, at first with white floccose squamules; g. free; s.

4-5 cm. white, downy at first, hollow; sp. 11 5-6.

[=muralis=, Allesch. Smell strong, ammoniacal. P. cylindr. then campan.

white then grey, covered with white floccose squamules; g. free, narrow; s. equal, hollow, floccosely scaly then glabrous, white, shining, base densely fibrous; sp. subg. 6.

=lagopus=, Fr. P. cylindr. then campan. coa.r.s.ely striate up to brown disc, at first with white flocci; g. free; s. 10-15 cm. everywhere with white floccose down; sp. 14-16 10-12.

Differs from _C. narcoticus_ in absence of smell. _C. lagopoides_ differs in tomentum breaking up into scales, and g. very distant from stem.

[=lagopoides=, Karst. P. campan. sulcate, disc livid, with free white scales, 4-7 cm.; g. distant from stem; s. up to 17 cm. white, floccose; sp. 6-8 5-6.

=macrocephalus=, B. P. cylindr. then campan. striate, ashy grey, disc brownish, sprinkled with pointed scales, 2 cm.; g. free; s. 3-5 cm.

dingy white, fibrillose below; sp. 11-13 7-8.

Differs from _C. lagopus_ in dark grey p.

[=tigrinellus=, Boud. P. elliptic-oblong then campan. striate, snow-white edge becoming rosy, pulverulent, with tawny flecks; g. free; s. 2 cm. white, base rather bulbous and often with blackish flecks; sp.

11 7.