tive characteristics of these genera may be stated as
follows:

Pores compacted together and forming a continuous stratum 1
Pores each a distinct tube, standing closely side by side Fistulina
1. Stem central, and stratum of spores easily separable
from the cap Boletus
1. Stratum of tubes not separating easily, cap covered
with coarse scales Strobilomyces
Stratum of tubes separating, but not easily; tubes
arranged in distinct, radiating lines. In Boletinus
porosus the tubes do not separate from the cap Boletinus
Stratum of pores not separable from cap; plant soft when
young, but becoming hard, corky, stipitate, shelving Polyporus

_Boletus. Dill._

_Boletus, a clod_. There are very many species under this genus and the
beginner will experience much trouble in separating the species with any
degree of assurance. The Boletus is distinguished from the other
pore-bearing fungi by the fact that the stratum of tubes is easily
separable from the cap. In the Polyporus the stratum of tubes cannot be
separated.

Nearly all Boleti are terrestrial and have central stems. They grow in
warm and rainy weather. Many are very large and ponderous; fleshy and
putrescent, decaying soon after maturity. It is important to note
whether the flesh changes color when bruised and whether the taste is
pleasant or otherwise. When I first began to study the Boleti there were
but few species that were thought to be edible, but the ban has been
removed from very many, even from the most wicked, Boletus Satanus.

_Boletus scaber. Fr._

THE ROUGH-STEMMED BOLETUS. EDIBLE.

[Illustration: Figure 282.--Boletus scaber. Two-thirds natural size.]

The pileus is from two to five inches in diameter, rounded convex,
smooth, viscid when moist, minutely woolly, velvety or scaly, color from
nearly white to almost black, the flesh white.

The tubes are free from the stem, white, long, mouths minute and round.

The stem is solid, tapering slightly upward, long, dingy-white;
roughened with blackish-brown or reddish dots or scales, this being the
most pronounced characteristic by which to distinguish the species;
three to five inches long. The spores are oblong fusiform and brown.

Prof. Peck has described a number of varieties under this species, most
of which depend on the color of the cap. All are