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

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THE BOLETES OF MICHIGAN

Stipe 3-5.5 cm long, 5-9 mm thick at apex, slightly enlarged downward, solid, interior watery yellowish, when cut with cinnabar-orange
stains in lower part or merely ochraceous there, at very base merely
watery buff; surface minutely furfuraceous-scabrous from fine particles
of ornamentation which are buffy pallid at first but become yellowish to
orange or finally cinnabar, base whitish.
Spore deposit about cinnamon-brown; spores 14-18 X 5-6.5 u,
smooth, shape in face view narrowly oval, in profile obscurely inequilateral to more or less narrowly oval (not typically "boletoid"), near buckthorn-brown in KOH singly, in groups tawny, in Melzer's paler; wall
only slightly thickened.
Basidia 4-spored, 26-32 X 9-12 /, clavate, with large hyaline globules as revived in KOH. Pleurocystidia-none found. Caulocystidia 32-46
X 7-11 Ju, and 50-80 X 9-16 L, fusoid in shape more or less but apex
obtuse.
Pileus cutis a tangled mass of appressed hyphae 4-9 L wide (when
fresh appearing as a collapsing trichodermium in a gelatinous matrix)
and with yellowish, granular content in water mounts when fresh but
more or less homogeneous in KOH, in Melzer's the hyphal content granular and dingy brownish, the hyphae tubular, the cells readily disarticulating and the end-cells narrowly cystidioid (tapered gradually to the
apex). Hyphae of context adjacent to the subcutis hyaline to weakly
yellow when revived in Melzer's. Clamp connections none.
Habit, habitat, and distribution.-Scattered under pine with alder
near by, Culhane Lake, Luce County, August 2, 1965, Smith 71933.
Observations.-The color changes of the stipe ornamentation are
unique in this subsection and do not progress to dark brown or blackish
in the manner typical of the genus. The species, however, is so obviously
related to others in this section that it would be folly to place it elsewhere. It should be carefully compared with L. singeri. If one disregards
the color change of the stipe ornamentation, the latter species still differs from L. subpulchripes in having more short cells in the epicuticular
hyphae, and in lacking proliferated caulocystidia.
Section LUTEOSCABRA Singer
Amer. Midl. Nat. 37:112. 1947
Pileus cuticle usually a trichodermium with at least a fair number
of short inflated cells in the trichodermial hyphae, or the layer appearing cellular because the inflated cells are so compactly arranged; the
hymenophore pallid to yellow when young.
Type species: Leccinum crocipodium.