THE GRAY BOLETUS.

[Illustration: Figure 302.--Boletus griseus. Two-thirds natural size.]

Griseus means gray. The pileus is broadly convex, firm, dry, almost
smooth, gray or grayish black. The flesh is whitish or gray.

The tubes are attached to the stem and slightly depressed around the
stem, nearly plane, their mouths being small, nearly round, white or
whitish.

The stem is slightly unequal, tapering downward, distinctly reticulated,
whitish or yellowish, sometimes reddish toward the base. The spores are
ochraceous-brown, 10-14x4-5u. _Peck._

This plant, with us, grows singly and it is infrequently found. I have
found it always in beech woods along Ralston's Run. It is found in
August and September.

_Boletus nigrellus. Pk._

THE BLACKISH BOLETUS. EDIBLE.

[Illustration: Figure 303.--Boletus nigrellus. Two-thirds natural size.]

Nigrellus is a diminutive of _niger_, black. The entire plant is
blackish except the pore surface.

The pileus is three to six inches broad, rather broadly convex or nearly
plane, dry, blackish. The flesh is soft and unchangeable.

The tube-surface is rather plane, adhering to the stem, sometimes
slightly depressed around the stem, the mouths being small, nearly
round; whitish, becoming flesh-colored, changing to black or brown when
wounded.

The stem is equal, short, even, black or blackish. The spores are dull
flesh-color, 10-12x5-6u.

When I first found this specimen I was inclined to call it B. alboater,
but its flesh-colored tubes served to distinguish it. I found the
specimens in Figure 303 on Edinger's Hill, near Chillicothe. The taste
is mild and fairly good. August and September.

_Boletus Americanus. Pk._

[Illustration: Figure 304.--Boletus Americanus. One-half natural size.]

This species will attract the attention of the collector because of its
very viscid cap. I found the specimens in Figure 304 growing on Cemetery
Hill, near Chillicothe, in company with Lactarius deliciosus. They were
growing near and under pine trees, both in dense groups and separately.
The caps were very viscid, yellow with a slight tinge of red. The stem
is covered with numerous reddish-brown dots.

The pileus is one to three inches broad, thin; at first rather globose,
convex, then expanded, sometimes broadly umbonate; very viscid when
moist, especially on the margin; yellow or becoming dingy or streaked
with red in age.

The tube-surface is nearly plane and the tubes join sq