rs from _M. vitrea_ in decurrent tooth to gills.

=vitrea=, Fr. P. 1.5-2.5 cm. livid brown, finely striate all over, no
trace of umbo or fleshy disc; g. adnate, not connected by veins; s. 6-9
cm. slightly striate, polished, pale, base fibrillose; sp. ----.

Differs from _M. aetites_ and _M. stanneus_ in gills not having a
decurrent tooth and not connected by veins.

=tenuis=, Bolton. White, tufted. P. 1-1.5 cm. brittle, camp. obtuse,
then exp. striate; g. adnate; s. 5-7 cm. thin, pellucid, glabrous; sp.
----.

_M. gypsea_ differs in decurrent tooth of gills, and strigose base of
stem.

V. FILIPEDES. _Stem very slender, flaccid, rooting, dry, juiceless.
Gills discoloured, edge paler._

=filopes=, Bull. P. 1-1.5 cm. camp. then exp. striate, livid grey; g.
free, white; s. 6-8 cm. flaccid, glabrous, rooting, base downy; sp.
----.

=iris=, B. P. 1-2 cm. exp. obtuse, slightly viscid, striate, blue when
young, then brownish with blue fibrils; g. free, tinged grey; s. 3-6 cm.
bluish below, tinged brown above, with scattered fascicles of down; sp.
----.

=amicta=, Fr. P. up to 1 cm. conico-camp. greyish, striate to middle,
dry, glabrous; g. free, grey; s. 6-10 cm. filiform, tough,
downy-pulverulent; sp. ----.

=plumbea=, Fr. P. 1-2 cm. convex then flattened, obtuse, sulcate, lead
colour powdered with white meal; g. adnate horizontal, grey; s. 6-8 cm.
elongated, pulverulent, grey, apex hyaline, base strigose, fragile; sp.
----.

[=ianthina=, Fr. P. conical, striate all over, glabrous, lilac; g.
broadest in front, greyish-white; s. attenuated, flaccid, glabrous,
slightly striate, brownish lilac.

Differs from _P. pura_ in persistently conical pileus.

=urania=, Fr. P. camp. then convex, dark violet when young, then blue
becoming pale; g. uncinato-adnate, white; s. flaccid, even, glabrous,
base rather rooting, floccose.

=debilis=, Fr. P. 1-1.5 cm. camp.-convex, striate, whitish or livid then
brownish, opaque, rugulose when dry; g. broadly adnate; s. 3-5 cm.
flaccid, base fibrillose not rooting; sp. ----.

[=lasiosperma=, Bres. P. striate, grey, umbo darker; g. greyish white;
s. white, pruinose, base brownish, strigosely rooting; sp. globose,
aculeate.

=vitilis=, Fr. P. 4-7 mm. conical then exp. papillate, deeply striate
when moist, brownish or greyish then pale; g. narrowed and adnate,
greyish white; s. 6-14 cm. livid, flexile, rooting; sp. ----.

Var. _amsegetes_, Secr. P. conico-campan. everywher