s expansion and the stem is longer.
Berkeley describes specimens of P. dryinus with long stems growing
from a hollow in an ash, and Stevenson (p. 167) reports the same
condition.

[Illustration: PLATE 36, FIGURE 109.--Pleurotus dryinus. Side and upper
view. Plant entirely white, scales sometimes buff or cream colored in
age (natural size). Copyright.]

=Pleurotus sulfureoides= Pk.--This rare species, first collected in the
Catskill Mountains 1869, and described by Peck in the 23rd Report, N. Y.
State Mus., p. 86, 1870, was found by me on two different occasions at
Ithaca, N. Y., during the autumn of 1898, on rotting logs, Ithaca Flats,
and again in Enfield Gorge, six miles from Ithaca. The plants are from
5--8 cm. high, the cap 3--5 cm. broad, and the stem 5--7 mm. in
thickness, and the entire plant is of a dull, or pale, yellow.

[Illustration: PLATE 37, FIGURE 110.--Pleurotus dryinus, form
corticatus. Entire plant white, scales cream or buff in age sometimes.
The ruptured veil shows in the small plant below (natural size).
Copyright.]

The =pileus= is nearly regular, fleshy, thin toward the margin, convex,
umbonate, smooth or with a few small scales. The =gills= are rather
crowded, broad, rounded or notched at the stem, pale yellow. The
=spores= are elliptical, 7--9 x 5--6 mu. The =stem= is ascending and
curved, nearly or quite central in some specimens in its attachment to
the pileus, whitish or yellowish, mealy or slightly tomentose at the
apex.

Figure 111 is from plants (No. 2953, C. U. herbarium) on rotting log,
Ithaca Flats, October, 1898.

[Illustration: FIGURE 111.--Pleurotus sulfureoides. Entire plant dull or
pale yellow (natural size). Copyright.]

=Pleurotus petaloides= Bull. =Edible.=--The petal-like agaric is so
called from the fancied resemblance of the plant to the petal of a
flower. The plant usually grows in a nearly upright or more or less
ascending position, or when it grows from the side of a trunk it is
somewhat shelving. It is somewhat spathulate in form, i. e., broad at
the free end and tapering downward into the short stem in a
wedge-shaped manner, and varies from 2--10 cm. long and 1--5 cm. in
breadth. It grows on fallen branches or trunks, on stumps, and often
apparently from the ground, but in reality from underground roots or
buried portions of decayed stumps, etc.

[Illustration: FIGURE 112.--Pleurotus petaloides. Color pale reddish
brown or brown, sometimes entirely white; gil