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, 10–12×5–6µ.
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.
Figure 304.—Boletus Americanus. One-half natural size.