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

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THE BOLETES OF MICHIGAN

Spore deposit "argus-brown" when freshly air-dried but on standing slowly becoming bister or more olivaceous-brown; spores 12-15
X 3.8-8.3 p, lacking an apical pore, wall only slightly thickened (less
than 0.5 g thick); in face view elongate-subelliptic to subfusiform, in
profile narrowly somewhat inequilateral, pale dingy ochraceous in both
KOH and Melzer's.
Basidia 22-34 X 9-11 g., clavate, hyaline in KOH and merely
weakly yellowish in Melzer's. Pleurocystidia abundant, 30-48 X 9-15 u,
fusoid-ventricose with the neck narrowed to a subacute apex, content
hyaline to smoky brown (in either KOH or Melzer's), brown ones most
numerous in areas where discoloration had occurred on the fresh specimen. Cheilocystidia 18-29 X 5-11, clavate, clavate-mucronate, or obscurely fusoid-ventricose with obtuse apex, walls yellowish brown in
KOH to hyaline, thin, collapsing readily. Caulocystidia numerous in the
caulohymenium 28-50 X (8) 10-20 p, clavate-pedicellate to clavatemucronate, thin-walled, smooth, content bister in KOH.
Tube trama subgelatinous, somewhat divergent to the subhymenium, hyphae hyaline, more or less tubular and thin-walled, oleiferous hyphae very rare. Pileus trama near the cuticle with dextrinoid
patches of pigment along the hyphae, the hyphal content in some dull
orange. Cutis of appressed hyphae 5-10 u wide, with thin-walled cells
having a smoky ochraceous content as revived in KOH, walls smooth or
in some irregularly roughened from a thin gelatinous sheath, end-cells
merely tapered somewhat to apex; the cell contents in Melzer's merely
yellowish orange or paler and granular, in a few hyphae rounding up
into beadlike globules but these not highly colored, no characteristic
formation of pigment globules noted. Subcuticular hyphae orange as
revived in Melzer's. Clamp connections absent.
Habit, habitat, and distribution.-Scattered under birch and aspen,
northwest corner of Montmorency County, July 17, 1967, Smith 74546.
Observations.-This species is characterized by the pale dingy
colors, the almost glandular-dotted stipe of young basidiocarps, the
narrow cuticular hyphae with only a suggestion of pigment-globule formation in Melzer's, and the orange subcuticular hyphae as revived in
Melzer's. It is closest to L. cinnamomeum, but the context of the latter
stains vinaceous before going to fuscous, and the cuticular hyphae, at
least some of them, are very broad and with short cells-much as in L.
insigne. In the dried condition the pilei of L. insolens var. insolens are a
dingy grayish brown.