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

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THE BOLETES OF MICHIGAN

"The surface of the pileus is rendered unevenly coarse by shallow
depressions. The species belongs to section Versipellis. The dots on the
stem are nearly like those on the stem of Boletus chromapes Frost."
The original description is quoted here. Microscopic data from the
type are as follows: Spores 9-12 X 34.5 p, smooth, lacking an apical
pore; shape in face view narrowly subelliptic to subfusoid, in profile
suboblong to obscurely inequilateral, color in KOH practically hyaline,
in Melzer's yellowish but a few reddish tawny, wall thin (-0.2,i)..Basidia 4-spored, 8-10 u broad, clavate, hyaline in KOH. Pleurocystidia 36-48 X 10-14 i, fusoid-ventricose, in Melzer's the content
usually vinaceous-red and amorphous, in KOH "empty," walls thin,
smooth, and hyaline. Cheilocystidia rather indistinct but apparently
mostly basidiole-like with yellow content in KOH and some amorphous
debris in the layer. Caulocystidia not studied.
Tube trama of the Boletus subtype, nonamyloid in all parts,
numerous laticiferous elements present, these 4-10 p wide and with
orange-ochraceous content evenly distributed or granular. Pileus cutis of
interwoven hyphae 4-10,i wide, tubular, end-cells subcylindric to subcystidioid, thin-walled, much debris in the layer, cell content of the
hyphae dull orange in Melzer's and content aggregating to form small
globules or irregular masses almost exactly as in Rhizopogon species (the
slides should be allowed to stand for about ten minutes), no amyloid
debris observed in or on the cells, laticiferous elements numerous in the
cuticle. Hyphae of subcutis merely yellowish in Melzer's and mostly
"empty." Clamp connections absent.
Observations.-We did not observe pigment globules in the cuticular hyphae of T. indecisus. The presence of globules in the cuticular hyphae of T. subpunctipes, the alveolate pileus, and the stipe ornamentation
as described by Peckdistinguish it from T. indecisus.
The following is a description of Michigan collections:
Pileus 5-15 cm broad, broadly convex expanding to plane or nearly so, rarely depressed; surface resinous to the touch but not truly
viscid, at maturity dry and subgranulose to unpolished, color evenly
"russet," "warm sepia," or "Mars-brown" (dark rusty brown), slowly
becoming paler yellow-brown ("buckthorn-brown"). Context white,
firm, taste sweetish to mild, when cut slowly staining "vinaceous-fawn"
to "avellaneous" or finally near "Verona-brown" (vinaceous to grayish
to dull cinnamon), with FeSO4 instantly blue, with KOH slowly yellow,
odor not distinctive.
Tubes white, stuffed when young, becoming nearly avellaneous and
where injured staining "Verona-brown," depressed around the stipe, about
1 cm. deep; pores about 1-2 per mm.