strong. P. 1.5-2.5 cm. camp. obtuse, naked, deeply
striate when moist, shining when dry, pallid or tinged yellowish-green;
g. adnate; s. 4-7 cm. yellowish, viscid, glabrous, shining, base
villose; sp. 8 x 5.

=ammoniaca=, Fr. Smell strong. P. 1.5-2 cm. conico-exp. umb. naked,
discoid, opaque, dark brown or greyish, striate at paler margin; g.
adnate; s. even, glabrous, rooting, pallid, 4-5 cm.; sp. ----.

_M. alcalina_ differs in tufted habit, viscid stem with yellow tinge of
colour.

=metata=, Fr. Smell weak, alkaline, soft. P. obt. striate, hygr.
grey--rarely yellowish or pinkish--even, opaque, and whitish when dry;
g. adnate, not connected by veins, whitish; s. 4-7 cm. firm, even,
glabrous, base fibrillose; sp. ----.

=cinerea=, Mass. and Crossl. Entirely grey, smell strong, like radishes.
P. 1.5-2 cm. subgibbous, exp. pale, silky and even when dry; g. adnate;
s. 5-7 cm. glabrous, downy and white at base; sp. 8 x 5; cystidia
fusiform.

_M. leptocephala_ differs in sulcate p., and _M. metata_ in white gills.
_M. plumbea_ has no smell.

=plicosa=, Fr. 1.5-2.5 cm. exp. plicato-sulcate, greyish brown, opaque
when dry; g. thick, distant, veined, grey; s. 3-4 cm. polished, greyish;
sp. globose, 4-5.

[=subplicosa=, Karst. P. campan. obtuse, with distant grooves, almost
plicate, glabrous, grey then pallid; g. adnate, whitish; s. rigid,
shining, hyaline or livid, base strigose not rooting; sp. 6-8 x 3-5.

=consimilis=, Cke. P. 1.5-2.5 cm. camp. grey, umbo darker, striate to
middle, margin upturned and splitting; g. adnexed, grey; s. 2.5-3.5 cm.
dry, smooth, paler than p.; sp. ----.

More or less resembling several species. _M. leptocephala_ and _M.
metata_ differ in strong smell. _M. peltata_ in orbicular plane pileus.
_M. rugosa_ differs in rugose pileus.

=peltata=, Fr. P. 1.5-2 cm. orbicular, soon plane, disc fleshy, blackish
brown then grey, margin striate; g. with decurrent tooth, grey; s. 3-4
cm. even, glabrous, base downy; sp. ----.

Differs from _M. pelliculosa_ in absence of viscid pellicle.

=aetites=, Fr. P. 1.5-2 cm. camp.-convex, coarsely striate, hygr. broad
obtuse umbo prominent, brownish; g. uncinate, thin, connected by veins;
s. 4-5 cm. glabrous, shining subcompressed; sp. ----.

=stannea=, Fr. P. 2-3 cm. exp. hygr. grey, even, and tin colour with a
silky sheen when dry; g. with decurrent tooth, connected by veins,
greyish white; s. 5-7 cm. even, shining, often compressed; sp. ----.

Diffe