=murinaceum=, Bull. Smell strong. P. 5-10 cm. exp. sometimes sub.u.mb.

grey, silky, cracking into squamules; g. deeply sinuate, broad, grey; s.

grey with darker squamules; sp. ----.

[=bisontinum=, Roll. P. pulvinate, cuticle thick, brown with greenish tinge, virgate with minute adpr. fibrils; g. thick, grey, with flat, transverse, more or less branched veins; s. solid, narrowed below, fibrillosely striate, with minute dark granules above, pale; 10-12 6.

=hordum=, F. P. exp. sub.u.mb. grey, dry, glabrous then breaking up into squarrose scales; g. rather distant, becoming greyish; s. 6-8 cm.

whitish, glabrous; sp.

=virgatum=, Fr. P. rigid, 5-9 cm. exp. umb. very dry, greyish, virgate with radiating blackish lines; umb. often broken up into squamules; g.

broadly emarginate, becoming greyish, crowded; s. 7-9 cm. striate, glabrous, whitish; sp. 6-8 5-6.

The only dry sp. with a virgate pileus.

[=dissultans=, Karst. P. fragile, thin, convexo-plane, acutely umb. very dry, h.o.a.ry with dense subreticulately interwoven superficial fibrils, grey; g. h.o.a.ry; s. hollow, equal, white, loosely fibrillose, apex pruinose; sp. 5-6 4.

[=elytroides=, Scop. P. exp. obt. scabrid, disc floccosely scurfy, grey; g. broad, grey; s. with dense fibrils directed upwards.

[=opic.u.m=, Fr. P. umb. even, soon squamulose, greyish as is also the flesh; g. arcuato-adfixed, h.o.a.ry; s. stuffed, equal, almost glabrous.

IV. SERICELLA. _Pileus at first silky, soon glabrous, quite dry._

* _Gills broad, thickish, rather distant._

=sulphureum=, Fr. Strong smelling. Entirely sulphur yellow or p. tinged rufous. P. 3-8 cm. sub.u.mb. silky, even; g. distant; s. 5-10 cm. striate, same colour inside; sp. 9-10 5.

=bufonium=, Pers. P. 3-7 cm. soon plane, sub.u.mb. silky, soon glabrous, rugulose, opaque, purplish brown, umber, or tan; g. yellowish-tan then pallid; s. 5-7 cm. flocculose, coloured like p.; sp. subgl. 4-5.

=lascivum=, Fr. Smell strong. P. 4-5 cm. exp. and subdepressed, even, silky then glabrous, tan colour then pallid; g. arcuately adnexed, crowded, white; s. 4-6 cm. solid, rigid, tomentose, whitish, apex mealy, rooting; sp. 8-10 4-5.

var. _robustum_, Cke. Robust. P. whitish, silky; smell weak or none.

=interveniens=, Karst. P. convexo-plane, depr. silky then glabrous, rugulose near edge, tan then pale; g. arcuato-adnex. crowded, pallid; s.

solid, equal, rooting, fibrillose, pallid; sp. 6-7 2-2.5.

=inamoenum=, Fr. Foetid. White. P. 2-4 cm. exp. umb. silky then glabrous, even; g. arcuato-adnexed, crowded; s. 7-10 cm. equal, solid, rooting; sp. 9-10 6-7.

The only white, foetid _Tricholoma_.

** _Gills thin, crowded, narrow._

=cerinum=, Pers. P. 2-4 cm. exp. obtuse or depressed, even, dry, almost glabrous, wax-yellow or brown; g. crowded, yellow; s. 2-3 cm. stuffed, fibrillosely striate, yellowish, base darker; sp. ----.

[=chrysenterum=, Bull. Entirely yellowish outside and inside. P. fleshy, convexo-plane, obsoletely umb. silky then almost glabrous; g. free, crowded, narrow; s. solid, base with white wool.

[=stiparophyllum=, Fr. Smell strong. P. exp. silky then glabrous, yellowish white; g. crowded, white; s. hollow, white, glabrous, apex mealy.

[=cerinum=, Pers. P. exp. depr. almost glabrous, waxy yellow or fuscescent; g. crowded, yellow; s. stuffed, fibrillosely striate, base glabrous, often brownish.

[=onychinum=, Fr. P. exp. sub.u.mb. dingy purple or brown, margin silky; g. yellow, crowded; s. pallid, apex reddish.

=ionides=, Bull. P. 2-4 cm. soon plane, umb. even, dingy violet then pale; g. crowded, white, edge irreg.; s. 3-4 cm. elastic, fibrillose, coloured like p.; sp. 6-7 3.5.

Differs from _T. humile_ and _T. sordidum_ in white gills.

var. _parvum_, Lasch. P. reddish brown.

var. _persicolor_, Fr. P. convexo-plane, peach-colour, then pale; g.

sinuate, white; s. paler than p.

=carneum=, Bull. P. 1.5-2.5 cm. fragile, exp. obtuse, glabrous, persistently reddish flesh colour; gills pure white; s. 2-2.5 cm.

coloured like pileus, not fading; sp. 3 2.

[=carneolum=, Fr. Small. P. plano-depr. obtuse, even, flesh-red then pale; g. closely crowded, very broad behind, shining white.

=caelatum=, Fr. P. 2-2.5 cm. persistently umbilicate glabrous, brown then greyish, becoming cracked; g. crowded; s. 2.5 cm. glabrous, brown; sp. 8 5.

B. _Pileus even, glabrous, neither villose, scaly nor viscid._

V. GUTTATA. _Pileus fleshy, soft, fragile, with drop-like markings; stem solid._

* _Gills not discoloured._

=gambosum=, Fr. P. 6-12 cm. flesh thick, exp. and wavy, glabrous, spotted, pallid tan, margin incurved and downy at first; g. crowded, ventricose; s. 5-7 cm. stout, flocculose at apex, white; sp. 13-14 8-9. Edible.

[=Georgii=, Clus. P. exp. rather wavy, dry, flocculosely soft, ochraceous, edge even, naked, ochraceous; g. linear, transversely striate, whitish; s. solid, stout, fibrillose. Edible.

=albellum=, Fr. P. 5-7 cm. conical then exp. gibbous, whitish, pallid, greyish when dry, mottled with spots, margin naked; g. crowded, broadest in front; s. 3-5 cm. fibrillosely striate, solid, white; sp. 6-7 4.

=boreale=, Fr. P. 4-6 cm. irreg. sub.u.mb. glabrous, rivulose when dry, margin even, naked, flesh-colour becoming pale; g. crowded; s. 5-8 cm.

solid, elastic, base narrowed, whitish; sp. subg. 4-5.

** _Gills discoloured, rufescent or smoky._

=amethystinum=, Scop. P. 3-5 cm. exp. wavy, glabrous, livid and spotted with bluish patches; g. crowded, white then rufescent; s. 3-5 cm. solid, narrowed at base, paler than p.; sp. ----.

[=graveolens=, Fr. P. compact, obt. glabrous, margin even, rivulose when dry, dusky brown; g. white then fuliginous; s. solid, firm, fibrillose.

=tigrinum=, Schaeff. P. 3-5 cm. exp. often wavy, glabrous, margin invol.

pale brown or greyish with brown spots; g. crowded, narrow, white then greyish; s. 2-3 cm. and nearly as thick, solid, white, pruinose; sp.

subgl. 8.

Differs from _T. guttatum_ in glabrous pileus with an even margin.

[=leucophaeatum=, Karst. (= _Coll. leucophaeatus_, Fr.). P.

convexo-plane, broadly and obtusely umb. pallid grey; with thin h.o.a.ry tomentum; g. crowded, whitish then dingy, broadest behind; s. equal, often curved, pallid, base strigose; sp. ----.

=pes-caprae=, Fr. P. 2-5 cm. conical then exp. umb. unequal, greyish brown, glabrous; g. broad, greyish white; s. 6-7 cm. naked, white; sp. 8 5.