[=brunneola=, Q. Chestnut umber. P. umbil. squamulose; g. arcuate, white; s. floccosely punctate, base with spreading fawn-coloured down; sp. 10.

[=atripes=, Rab. P. thin, plano-depr. infundib. brown, pale and silky shining when dry; g. very broad behind, brownish, albo-pruinose; s.

black, base bluish-pruinose.

[=Laestadii=, Fr. P. hemispherical, umbil. even, tawny-bay, shining; g.

distinct, yellow; s. rigid rufous bay.

=picta=, Fr. P. 1 cm. campan. cucullate, umbil. glabrous, striate, fuscous; g. very broad, pallid; s. h.o.r.n.y, bay, membranous spreading base tawny; sp. 7-10 4.

=camptophylla=, B. P. 1 cm. convex then exp. deeply striate, disc brown, rest pale grey; g. ascending then abruptly decur. white; s. 3-4 cm. very slender, whitish, base radiately strigose; sp. 8-10 6-8.

[=cyanophylla=, Fr. P. thin, camp. umbil. striate, livid or bluish becoming yellowish; g. clear blue; s. glabrous; sp. 5-7 3-4.

[=Cornui=, Q. P. umbil. tawny; g. yellow with violet tinge; s. h.o.r.n.y, bay, base inflated, downy, yellow.

[=reclina=, Fr. P. thin, rigid camp. then entirely infundib. livid; g.

thick, white or grey; s. tough; sp. 6 4-5.

[=deflexa=, Karst. P. campan.-convex, mostly umbil. everywhere striate, fuscescent or pale livid, pale when dry; g. decur. arcuate, white; s.

solid, tough, pallid, glabrous; sp. 6-7 4-6.

=umbratila=, Fr. P. 2 cm. thin, campan. then convex, umbil. umber brown, hygr.; g. broad, brownish; s. 3-4 cm. stuffed, brownish; sp. 7 5.

Readily mistaken with _Coll. atrata_ and _C. ambusta_, differs in subdecur. gills.

[=invita=, Karst. P. convex, umbil. glabrous, striate when moist, sooty or livid sooty, pale when dry; g. adnate, very broad, white; s. colour of p.; sp. glob. 5-6.

=grisea=, Fr. P. 1-1.5 cm. camp. glabrous, everywhere striate, livid grey then h.o.a.ry; g. distant, greyish; s. greyish-white, apex thickened, 5-7 cm.; sp. 7-8 4.

[=setipes=, Fr. P. convex, subpapillate, everywhere striate, brownish-grey; g. greyish white, connected by veins; s. filiform, base p.u.b.escent; sp. 6-7 2-3.

=fibula=, Bull. P. up to 1 cm. cucullate then exp. umbil. striate, orange yellow then pale; g. deeply decur. pale; s. 3-4 cm. very slender, weak, pale orange; sp. 4-5 2.

var. _Swartzii_, Fr. Apex of stem violet.

[=chlorocyanea=, Pat. Small, entirely bluish green outside and inside.

P. convex; g. distant, decur. unequal; s. solid, slender.

=directa=, B. and Br. P. 2-3 mm. nail-shaped flat at apex, white; g.

decur. white; s. rather wavy, 2 cm. whitish, tinged rufous, with long hairs at base.

=belliae=, Johnst. P. 1 cm. thin, dry, top-shaped, infundib. pallid; g.

decur. thick, veined; s. 2-3 cm. brownish, adhering by a cottony base.

[=pectinata=, Rom. Entirely white, glabrous, hygr. P. thin, convex, umbil. edge wavy or lobed, sulcate to middle; g. decur. distant; s.

subequal, almost glabrous; sp. 6-7 3.

=gracillima=, Weinm. Snow-white. P. 4-5 mm. downy, sulcate; g. decur.

distant, thin; s. 1.5 cm. filiform, base cottony; sp. 6-7 3.

[=gracilis=, Q. Snow-white. P. apiculate, striato-sulcate, glabrous; g.

arcuate, distant; s. filiform, pellucid, pruinose, base downy, rooting; sp. 8 2.

[=candida=, Bres. Shining white. P. thin, convex, exp. often papillate, glabrous, pellucidly striate; g. deeply decur. connected by veins at base; s. splitting into fibres, glabrous, base rooting, strigose; sp.

9-11 4.5-5.

=bullula=, Brig. White. P. 3-4 mm. even, hemisph. diaphanous; g. arched, decur.; s. 2 cm. filiform.

** _Gills fold-like, narrow._

=integrella=, Pers. White. P. 3-7 mm. hemisph. then exp.

pellucid-striate; g. equal, fold-like, distant, rather branched; s. very slender, p.u.b.escent; sp. 6-7 4.

[=microscopica=, Wirt. Minute, diaphanous. P. 3-4 mm. infundib. 4-6, sulcate; g. very narrow, arcuate; s. capillary.

=polyadelphus=, Lasch. Pure white. P. 2-3 mm. coa.r.s.ely striate and minutely flocculose; g. decurrent; s. 1-2 cm. very slender, base downy; sp. 5 2.5.

[=cuspidata=, Q. Hyaline white. P. very ac.u.minate, striate, flocculose; g. decur. branched; s. filiform, pulverulent, the slight bulb hairy; sp.

8 long.

[=crispula=, Q. White, diaphanous. P. crisped, pruinose; g. wrinkled, very thin; s. short, filiform, pruinose; sp. 8 long.

[=gibba=, Pat. (= _Cyph.e.l.la infundibuliformis_, Fr.). White, minute. P.

trumpet-shaped, gibbous then deeply infundib. downy; g. mere traces of folds; s. slender, downy.

PLEUROTUS, Fr.

A. EXCENTRICI. _Pileus entire, extended laterally, excentric but not truly lateral._

* _Veil forming a ring on the stem._

=corticatus=, Fr. P. 8-18 cm. convex then exp. covered with dense greyish down then floccosely squamulose; g. decur. white, anastomosing behind; tinged yellow when old; s. 3-7 cm. subexc. rooting, ring torn; s. 9-14 4-6.

[=Albertinii=, Fr. P. convex, dimidiate, sooty, with black squamules; g.

decur. distinct, white; s. with black squamules up to sooty ring.

=dryinus=, Pers. P. 5-9 cm. oblique or subcircular, hard, whitish with brownish spot-like squamules, flesh white then yellowish; g. decur. not anastomosing behind, white tinged yellow; s. 2-3 cm. sublateral, ring fugacious, torn; sp. 10 4.

Differs from _P. corticatus_ in gills not anastomosing behind.

=spongiosus=, Fr. P. 5-8 cm. spongy, pulvinate, greyish tomentose; g.

sinuato-adnexed, white, simple; s. 1-3 cm. tomentose, white, ring white, soon torn; sp. 8-10 4.

[=calyptratus=, Lindbl. P. soft, lateral-dimidiate, horizontal, reniform, glabrous, viscid, sooty or livid; g. adnate to a nodule, crowded, white then yellowish; s. a downy nodule, viscid membranous ring torn.

** _Gills sinuate or obtusely adnate._