phorescence is marked, but when the plants become old they often
fail to show it.

[Illustration: FIGURE 92.--Clitocybe illudens. Entire plant rich saffron
yellow, old plants become sordid brown sometimes; when fresh shows
phosphorescence at night (2/3 natural size, often much larger).
Copyright.]

=Clitocybe multiceps= Peck. =Edible.=--This plant is not uncommon during
late summer and autumn. It usually grows in large tufts of 10 to 30 or
more individuals. The caps in such large clusters are often irregular
from pressure. The plants are 6--12 cm. high, the caps 5--10 cm. broad,
and the stems 8--15 mm. in thickness. The =pileus= is white or gray,
brownish gray or buff, smooth, dry, the flesh white. The =gills= are
white, crowded, narrow at each end. The =spores= are smooth, globose,
5--7 mu in diameter. The stems are tough, fibrous, solid, tinged with the
same color as cap. Fig. 93 is from plants (No. 5467, C. U. herbarium)
collected at Ithaca, October 14, 1900.

COLLYBIA Fr.

In the genus _Collybia_ the annulus and volva are both wanting, the
spores are white, the gills are free or notched, or sinuate. The stem is
either entirely cartilaginous or has a cartilaginous rind, while the
central portion of the stem is fibrous, or fleshy, stuffed or fistulose.
The pileus is fleshy and when the plants are young the margin of the
pileus is incurved or inrolled, i. e., it does not lie straight against
the stem as in _Mycena_.

Many of the species of _Collybia_ are quite firm and will revive
somewhat after drying when moistened, but they are not coriaceous as in
_Marasmius_, nor do they revive so thoroughly. It is difficult, however,
to draw the line between the two genera. Twenty-five of the New York
species of Collybia are described by Peck in the 49th Report N. Y. State
Mus., p. 32 et seq. Morgan describes twelve species in Jour. Cinn. Soc.
Nat. Hist., 6: 70--73.

=Collybia radicata= Rehl. =Edible.=--This is one of the common and
widely distributed species of the genus. It occurs on the ground in the
woods or groves or borders of woods. It is quite easily recognized by
the more or less flattened cap, the long striate stem somewhat enlarged
below and then tapering off into a long, slender root-like process in
the ground. It is from this "rooting" character that the plant gets its
specific name. It is 10--20 cm. high, the cap 3--7 cm. broad, and the
stem 4--8 mm. in thickness.

The =pileus= is fleshy, thin, convex to