pileus fibrous and somewhat uneven but not scaly. The plants are
2--12 cm. long by 1--8 cm. broad, often many crowded together in an
imbricated manner. The =gills= are pale yellow, and the =spores= are of
the same color when caught on white paper, and they measure 4--5 x 3--4
mu, the size given for European specimens of this species. The gills are
forked, somewhat anastomosing at the base, and sinuous in outline,
though not markedly corrugated as in the next form. From descriptions of
the European specimens the plants are sometimes larger than these here
described, and it is very variable in form and often imbricated as in
the following species.

=Paxillus corrugatus= Atkinson.--This very interesting species was
collected at Ithaca, N. Y., on decaying wood, August 4, 1899. The pileus
is lateral, shelving, the stem being entirely absent in the specimens
found. The =pileus= is 2--5 cm. broad, narrowed down in an irregular
wedge form to the sessile base, convex, then expanded, the margin
incurved (involute). The color of the cap is yellow, maize yellow to
canary yellow, with a reddish brown tinge near the base. It is nearly
smooth, or very slightly tomentose. The flesh is pale yellow, spongy.
The =gills= are orange yellow, 2--3 mm. broad, not crowded, regularly
forked several times, thin, blunt, very wavy and crenulate, easily
separating from the hymenophore when fresh; the entire breadth of the
gills is fluted, giving a corrugated appearance to the side. The
=spores= in these specimens are faintly yellow, minute, oblong, broadly
elliptical, short, sometimes nearly oval, 3 x 1.5--2 mu. The =basidia=
are also very minute. The spores are olive yellow on white paper. The
plant has a characteristic and disagreeable odor. This odor persists in
the dried plant for several months.

Figure 162 is from the plants (No. 3332 C. U. herbarium) collected as
noted above on decaying hemlock logs in woods. A side and under view is
shown in the figure, and the larger figure is the under-view, from a
photograph made a little more than twice natural size, in order to show
clearly the character of the gills. The two smaller plants are natural
size. When dry the plant is quite hard.

[Illustration: PLATE 53, FIGURE 162.--Paxillus corrugatus. Cap maize
yellow to orange yellow, reddish brown near the base; gills orange
yellow. Two lower plants natural size; upper one 2-1/2 times natural
size. Copyright.]

[Illustration: PLATE 54, FIGURE 16