The boletes of Michigan, by Alexander H. Smith and Harry D. Thiers.

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THE BOLETES OF MICHIGAN

4. Tylopilus indecisus. Most abundant under oak in hot wet weather;
has been confused as a mild-tasting T. felleus.
5. Tylopilus chromapes. Abundant in June and July and even into
August during hot wet weather, and mostly in stands of aspen.
6. Suillus cavipes. Fall, under larch in bogs. Beware of poison sumac
when collecting this species.
7. Suillus pictus. Under white pine, summer and early fall. But we
have not found it in plantations of white pine. It appears to
favor the trees nearer maturity.
8. Suillus luteus. Plantations of Scotch pine, September to November.
9. Suillus granulatus. Under white pine more frequently than any
other, late summer and fall.
10. Suillus albidipes. Under pine, often in plantations of white pine, late
summer and fall.
11. Suillus brevipes. Late summer and fall under 2 or 3 needle pines.
12. Gyroporus cyanescens. Edible and choice (if you can effectively
remove the sand), summer and fall, especially along roadsides or
beside trails.
FIELD KEY TO MICHIGAN BOLETES
TO SPECIES OR GROUPS
(as recognized in the text)
Note that undesirable species are designated with a minus sign (-), and edible species
with an *.
1. Cap covered with coarse dry gray to blackish scales; tube layer pallid
when young, staining reddish when injured; veil breaking to leave an
annulus or zone on the stipe................... (-) Strobilomyces
1. Not with above combination of features........................ 2
2. Stipe having roughness in the form of small to distinct scales, points
or fine dots and these either black when young or becoming dark
brown to black by maturity or in age, rarely red or reddish brown
at first; cap typically dry to velvety and orange reddish to gray-brown
to pallid................................ (*) Leccinum
2. Not as above.................................... 3
3. Veil floccose and dry, bright sulphur-yellow............ Pulveroboletus
3. Veil absent or not as above.............................. 4
4. With any 2 of the following features:
a) Stipe with glandular dots or smears (the fingers become stained
from handling the stipe).