_Mycena acicula_ differs in yellow gills and rooting stem.

=ocellata=, Fr. P. 1-1.5 cm. exp. disc depr. round pale small umbo, rufous or yellowish; g. crowded, white; s. 3-5 cm. slender, tough, glabrous, tinged fuscous, base rooting, fibrillose; sp. ----.

Distinguished from _C. cirrhata_ by glabrous stem.

[=floridula=, Fr. P. exp. obtuse, slightly striate, tinged flesh colour then pale; g. pale rose colour; s. pellucid, white.

[=Micheliana=, Fr. Pure white. P. obtuse, margin slightly striate; g.

adnexed, crowded; s. thin, glabrous, base slightly thickened.

=muscigena=, Schum. Pure white. P. 2-4 mm. obtuse, even; g. adnate; s.

1.5-2.5 cm. very slender, wavy, equal, glabrous; sp. ----.

Known from small sp. of _Mycena_ by the broadly adnate gills and even pileus.

[=ludia=, Fr. Pure white. P. sub.u.mb. exp. revolute, undulate and irreg.

lobed, even; g. rather distant; s. slender, wavy, naked, root creeping, branched, fibrillose.

B. _Gills grey._

IV. TEPHROPHANAE. _Brown or greyish._

* _Gills crowded, rather narrow._

=rancida=, Fr. Smell strong. P. 2-5 cm. umb. dusky grey with a white silkiness; g. free, narrow, grey; s. 7-12 cm. glabrous, grey, rooting; sp. 7-10 4-5.

Distinguished among strong-smelling species by the rooting stem.

[=ign.o.bilis=, Karst. P. plane, subdepr. edge spreading, livid, h.o.a.ry, pale when dry; g. crowded, dingy pallid; s. livid, floccosely pruinose; sp. 7-8 4.

[=daemonica=, Karst. P. convex then exp. sub.u.mb. glabrous, rather virgate, livid fuscous, disc blackish, pale when dry; g. adnate, crowded, smoky, blackish when bruised; s. equal, glabrous, wavy, fibrillosely striate, pallid, apex white flocculose; sp. 8-10 4-5.

=coracina=, Fr. Smell strong. P. 2-3 cm. exp. naked, hygr. brownish then grey; g. greyish-white; s. 2-3 cm. hollow, rigid, not rooting, brown, apex mealy-squamulose; sp. ----.

Differs from _C. rancida_ in the short stem thickened at base, and not rooting; _C. ozes_ differs from present in long, slender, flexuous stem.

=ozes=, Fr. Smell strong. P. 3-5 cm. exp. umb. naked, glabrous, hygr.

margin striate, greyish brown; g. adnexed, grey then olive; s. 6-10 cm.

subflexuous, slender, fragile, slightly striate, grey, apex with white meal; sp. ----.

_C. rancida_ differs in free gills and rooting stem.

[=mephitica=, Fr. Smell strong. P. exp. sub.u.mb. even, adpressedly innately silky, whitish; g. obtusely adnate, crowded, whitish; s.

filiform, obsoletely fistulose, tough, grey, pruinosely velvety.

=inolens=, Fr. P. 2-5 cm. exp. umb. glabrous, livid or pale tan; g.

adnexed, greyish-white; s. 5-9 cm. livid, undulate, base white-strigose, apex white squamulose; sp. 7-8 4-5.

_C. plexipes_ and _C. protracta_ differ in having the stem glabrous at the apex.

=plexipes=, Fr. P. 2-4 cm. camp. rather rugulose, slightly striate, glabrous, sooty; g. free; s. 5-7 cm. livid, silky fibrillose, rooting; sp. 8-9 5.

Differs from _C. protracta_ in free gills.

[=miser=, Fr. P. sub.u.mb. glabrous, margin striate; g. adnate, grey; s.

fuscous, apex mealy.

[=atramentosa=, Kalchb. P. exp. sub.u.mb. rugulose, livid then sooty, flesh black; g. narrow, becoming blackish; s. naked, colour of p.

[=fuliginaria=, Weinm. P. fuscous, with down; g. glaucous; s. fuscous, flocculose.

=atrata=, Fr. P. 2-3 cm. pitch-black then brown, even, exp. or depr.

margin arched; g. adnate; s. 2-2.5 cm. even, glabrous, brown outside and inside; sp. ----.

=ambusta=, Fr. P. 1-2 cm. exp. papillate, slightly striate, glabrous, livid brown; g. adnate, tinged fuscous; s. 1.5-2 cm. somewhat stuffed, tough, livid; sp. 5-6 3-4.

Differs from _C. atrata_ in umbonate pileus.

** _Gills very broad, more or less distant._

=lacerata=, Lasch. P. 2.5-3.5 cm. camp. moist, streaked dark brown on pale ground; g. adnexed, broad, thick, greyish; s. 5-9 cm. twisted, fibrous, apex floccose; sp. ----.

[=phalliodorus=, Alex. Foetid, convex, sub.u.mbilicate, at length lobed, dingy ochraceous; g. adnate, white; s. glabrous.

=murina=, Fr. P. 2-4 cm. exp. umbilicate, glabrous then rugulosely squamulose, dark brown then pale; g. slightly adnexed, broad; s. 5-7 cm.

hollow, cylindrical, not rooting, grey; sp. 7 4.

Somewhat resembling _C. atrata_, differing in very broad almost free gills.

[=glacialis=, Fr. P. watery, fragile, obtuse, dusky fuscous then pale; g. free, grey; s. grey, naked.

=protracta=, Fr. P. 1.5-2 cm. exp. shining, disc fleshy, depressed, subpapillate, greyish brown, margin striate; g. broad, grey; s. 5-7 cm.

glabrous, root long fibrillosely strigose; sp. ----.

=tesquorum=, Fr. P. 1-1.5 cm. plane, obtuse, even, blackish then pale; g. free, greyish brown; s. 3-5 cm. thin, brown, apex pruinose; sp. ----.

[=cessans=, Karst. P. exp. then depr. glabrous, striate, pallid fuscous then pale and h.o.a.ry, sublubricous; g. adnate, then adnato-decur.

connected by veins, whitish; s. solid, pallid, apex pruinose.

=clusilis=, Fr. P. 1-2 cm. exp. umbilicate, glabrous, hygr. livid then pale; g. arcuately adfixed, semicircular, broad; s. 2-4 cm. glabrous, pallid, not rooting; sp. ----.

Differs from _C. tylicolor_ and _C. nummularia_ in umbilicate pileus, and decurrent tooth to gills.

[=erosa=, Fr. P. exp. striate, hygr. silky when dry, grey; g. broadly emarginate, greyish; s. greyish-white, glabrous.

=tylicolor=, Fr. P. 1-2 cm. exp. sub.u.mb. even, glabrous, bluish-grey, with white meal when young; g. free, distant, broad, grey; s. 2-3 cm.

pulverulent, grey; sp. ----.