or white, blue,
clothed with blue hairs at base (natural size). Copyright.]

The =pileus= is conic, then bell-shaped, and as the margin of the cap
expands more appears umbonate, obtuse, smooth, even or somewhat striate
on the margin. The color varies from whitish to flesh color, or dull
red, and appears more or less saturated with a red juice. The thin
margin extends a short distance beyond the ends of the gills, and the
margin is then beautifully crenate. The =gills= are adnate, and often
extend down on the stem a short distance by a little tooth. The =stem=
is firm, sometimes smooth, sometimes with minute hairs, at the base
with long hairs, hollow, in color the same as that of the pileus.

[Illustration: FIGURE 102.--Mycena haematopa. Dull red or flesh color, or
whitish, a dull red juice exudes where broken or cut, margin of cap
serrate with thin sterile flaps (natural size). Copyright.]

The color varies somewhat, being darker in some plants than in others.
In some plants the juice is more abundant and they bleed profusely when
wounded, while in other cases there is but little of the juice,
sometimes wounds only showing a change in color to a deep red without
any free drops exuding. Figure 102 is from plants collected at Ithaca,
in August, 1899. It is widely distributed in Europe and North America.

=Mycena succosa= Pk., another species of _Mycena_ with a juice, occurs
on very rotten wood in the woods. It is a small plant, dull white at
first, but soon spotted with black, and turning black in handling or
where bruised, and when dried. Wounds exude a "serum-like juice," and
the wounds soon become black. It was described by Peck under _Collybia_
in the 25th Report, p. 74.

OMPHALIA Fr.

The genus _Omphalia_ is closely related to _Mycena_ and _Collybia_. It
differs from these mainly in the decurrent gills. In the small species
of _Mycena_ where the gills are slightly decurrent, the pileus is not
umbilicate as it is in corresponding species of _Omphalia_. In some of
the species of _Omphalia_ the pileus is not umbilicate, but here the
gills are plainly decurrent. The stem is cartilaginous.

[Illustration: PLATE 33, FIGURE 103.--Omphalia campanella. Watkin's
Glen, N. Y., August, 1898. Caps dull reddish-yellow. Gills yellow. Stem
brownish, hairy at base. (Natural size.) Copyright.]

=Omphalia campanella= Batsch.--One of the most common and widely
distributed species of the genus is the little bell-omphalia, _Ompha