sweet and
agreeable. Palmer compares it with the taste of a walnut. The plant
should not be feared because the flesh turns blue when bruised. I first
found this species in Whinnery's woods, Salem, Ohio. The specimens in
Figure 284 grew near Chillicothe and was photographed by Dr. Kellerman.
July to August.

_Boletus chrysenteron. Fr._

THE RED-CRACKED BOLETUS. EDIBLE.

[Illustration: Figure 285.--Boletus chrysenteron. One-half natural size.
Caps yellowish to red. Flesh yellow.]

Chrysenteron means gold or golden within. The pileus is two to four
inches broad, convex, becoming more flattened, soft to the touch,
varying from light to yellowish-brown or bright brick-red, more or less
fissured with red cracks; the flesh yellow, changing to blue when
bruised or cut, red immediately beneath the cuticle.

The tube surface is olive-yellow, becoming bluish when bruised,
tube-openings rather large, angled and unequal in size.

The stem is generally stout, straight, yellowish, and more or less
streaked or spotted with the color of the cap. The spores are light
brown and spindle-shaped. This species will be easily distinguished from
B. subtomentosus because of its bright color and the cracks in the cap
turning red, whence the name of the "Red-cracked Boletus."

The cap of this species strongly resembles Boletus alveolatus, but the
latter has rose-colored spores and a red pore surface, while the former
has light brown spores and an olive-yellow pore surface. Tolerton's and
Bower's woods, Salem, Ohio, July to October.

_Boletus edulis. Bull._

THE EDIBLE BOLETUS.

[Illustration: Plate XLII. Figure 286.--Boletus edulis.

Pileus light brown, tubes yellowish or greenish-yellow. Stem bulbous and
faintly reticulate. Natural size.]

This is quite a large and handsome plant and one rather easily
recognized. The firm caps of the young plant and the white tubes with
their very indistinct mouths, and the mature plants with the tubes
changing to a greenish yellow with their mouths quite distinct, are
enough to identify the plant at once.

The pileus is convex or nearly plane; variable in color, light brown to
dark brownish-red, surface smooth but dull, cap from three to eight
inches broad. The flesh is white or yellowish, not changing color on
being bruised or broken.

The tube-surface is whitish in very young plants, at length becoming
yellow and yellowish-green. Pore openings angled. The tubes depressed
around the stem