ne, and they are
set squarely against the stem. They are small, the mouths rounded,
brownish, then dull ochraceous, and dotted with glandules. The =stem= is
rather long, proportionately more so than in the granulated boletus. It
distinctly tapers upwards, is "rhubarb yellow," and dotted with
glandules. This character of the stem suggested the name of the species.
The =spores= are 8--10 x 4--5 mu. Figure 172 is from plants (No. 4067 C.
U. herbarium) collected at Blowing Rock, N. C. It is closely related to
_B. granulatus_ and by some is considered the same.

=Boletus luteus= Linn. (_B. subluteus_ Pk.) This species is widely
distributed in Europe and America, and grows in sandy soil, in pine or
mixed woods or groves. The plants are 5--8 cm. high, the cap 3--12 cm.
in diameter, and the stem 6--10 mm. in thickness. The general color is
dull brown or yellowish brown, and the plants are slimy in moist
weather, the stem and tubes more or less dotted with dark points. These
characters vary greatly under different conditions, and the fact has led
to some confusion in the discrimination of species.

[Illustration: FIGURE 173.--Boletus luteus. Cap viscid when moist, dull
yellowish to reddish brown, tubes yellowish, stem punctate both above
and below the annulus (natural size). Copyright.]

The =pileus= is convex, becoming nearly plane, viscid or glutinous when
moist, dull yellowish to reddish brown, sometimes with the color
irregularly distributed in streaks. The flesh is whitish or dull
yellowish. The =tube= surface is plane or convex, the tubes set squarely
against the stem (adnate), while the tubes are small, with small, nearly
rounded, or slightly angular mouths. The color of the tubes is yellowish
or ochre colored, becoming darker in age, and sometimes nearly brown or
quite dark. The =stem= is pale yellowish, reddish or brownish, and more
or less covered with glandular dots, which when dry give a black dotted
appearance to the stem. In the case of descriptions of _B. luteus_ the
stem is said to be dotted only above the annulus, while the description
of _B. subluteus_ gives the stem as dotted both above and below the
annulus. The =spores= are yellowish brown or some shade of this color
in mass, lighter yellowish brown under the microscope, fusiform or
nearly so, and 7--10 x 2--4 mu. The =annulus= is very variable, sometimes
collapsing as a narrow ring around the stem as in Fig. 173, from plants
collected at Blowing Rock, N