edge wavy or lobed, sulcate to middle; g. decur. distant; s.
subequal, almost glabrous; sp. 6-7 x 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 x 3.

[=gracilis=, Q. Snow-white. P. apiculate, striato-sulcate, glabrous; g.
arcuate, distant; s. filiform, pellucid, pruinose, base downy, rooting;
sp. 8 x 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 x 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, pubescent; sp. 6-7 x 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. coarsely striate and
minutely flocculose; g. decurrent; s. 1-2 cm. very slender, base downy;
sp. 5 x 2.5.

[=cuspidata=, Q. Hyaline white. P. very acuminate, 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. (= _Cyphella 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 x 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 x 4.

Differs from _P. corticatus_ in gil