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

BOLETUS

357

narrowed at the apex, hyaline or nearly so in KOH and reddish brown
in Melzer's (dextrinoid), subcutis tawny in KOH and in Melzer's, walls
smooth. Hyphae of adjacent context with ochraceous content in some as
revived in Melzer's, the fleeting-amyloid reaction strong on young pilei.
Clamp connections absent.
Habit, habitat, and distribution.-Gregarious under brush (Corylus)
along a woods road in a beech-maple forest, Colonial Point, Burt Lake,
Cheboygan County, August 11, 1969, Smith 77831.
Observations.-This is one of the species which has caused untold
confusion relative to the recognition of B. erythropus and B. subvelutipes in this country. Actually, the species belongs in a group with
B. subluridellus and B. roseobadius. The elongated caulocystidia of this
group are not cells with a hyphal-like proliferation as found in some
species of Leccinum. These cystidia are found on the stipe at or above
the midportion and are not to be confused with any of the mycelial
structures evident around the base. As they are found on young as well
as on mature basidiocarps, the age of the latter is not a major factor in
their morphological features. B. rufocinnamomeus differs from B. subvelutipes in that the base of the stipe is not strigose with red hairs even
though red pigment is a feature of the base of the stipe of that species,
and the pilei as dried retain a dark brown to reddish brown tone.
194. Boletus subvelutipes Peck
Rept. N. Y. State Mus. 2(8):142. 1889
Suillus subvelutipes Kuntze, Rev. Gen. Pl. 3(2):536. 1898.
Illus. Figs. 102, 104-5.
"Pileus convex, firm, subglabrous, yellowish brown to reddish
brown, flesh whitish, both it and the tubes changing to blue where
wounded; tubes plane or slightly convex, nearly free, yellowish, their
mouths small, brownish red; stem equal or slightly tapering upward,
firm, even, somewhat pruinose above, velvety with a hairy tomentum
toward the base, yellow at the top, reddish-brown below, varied with
red and yellow within; spores.00006 to.0007 in. long,.002-.00025
broad.
"Pileus 2-3 in. broad; stem 2-3 in. long, 4-6 lines thick."
Peck compared it to B. vermiculosus. We have quoted the original
description above and add microscopic data from what appears to be the
type: Saratoga, New York, July.