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

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THE BOLETES OF MICHIGAN

Observations.- The pore surface has an olive tinge over undamaged portions even in age, whereas f. insigne at a comparable stage has
pores dingy yellowish cinnamon. In the epicutis of f. lateritium there is
a stronger tendency to produce short oval to subglobose cells in the wide
hyphae than was noted for f. insigne. In both after drying, the pileus is
grayish brown to dingy dull cinnamon. When fresh the pileus in f.
lateritium is distinctly fibrillose and the color more rusty orange than in
f. insigne.
81f. Leccinum insigne f. squamosum
Pileus 5-10 cm broad, convex expanding to nearly plane, margin
sterile and incurved, rusty orange on margin rusty red on disc and becoming darker red in age, buttons rusty orange overall, surface dry at
first, subviscid in age, in age often conspicuously fibrillose-squamulose
from distinct appressed-fibrillose scales. Context white, slowly changing
directly to violaceous-fuscous when cut, FeSO4 on cut surface bluish,
odor and taste not distinctive.
Tubes white then olivaceous-pallid, finally dark dingy yellowish
brown, depressed around the stipe; pores minute, when lightly bruised
staining weakly yellow-brown, to dingy brown (staining avellaneous to
fuscous when severely bruised).
Stipe 7-12 cm long, 11-18 (20) mm thick, equal, solid, pallid,
staining fuscous when cut; surface with coarse ornamentation which is
brown but first merely darkens, though by late maturity it is blackish.
Spore deposit near bister as air-dried; spores 13-15 X 3.5-4.5 l.
Caulocystidia mostly clavate with bister content as revived in KOH, of
various sizes. Pileus cutis as in f. insigne only with more hyphae 12-26,
wide, content of wide hyphae homogeneous to granular in Melzer's both
in fresh and dried condition. Clamp connections absent.
Habit, habitat, and distribution.-Scattered to gregarious in aspenbirch conifer stands, Montmorency County, July 18, 1967, Smith
74571.
Observations.-Because of the dark red pileus of mature basidiocarps we at first thought of L. aurantiacum but the cut flesh does not
change to cinnamon reddish before going to fuscous, the cuticular
hyphae of the pileus are an excellent example of the L. insigne type,
and the stipe ornamentation tends to be blackish sooner, but this is
difficult to interpret especially on collections of fewer than a dozen
basidiocarps in various developmental stages. The color of the pileus
distinguishes it from L. atrostipitatum if basidiocarps are encountered
which have become arrested in their development but in which the stipe
ornamentation has blackened.