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

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THE BOLETES OF MICHIGAN

Basidia 4-spored, 26-35 X 7-9 j, narrowly clavate, yellowish hyaline in KOH. Pleurocystidia-none found. Pileus cuticle a gelatinized
trichodermium matted down to a pellicle, the hyphae 3-7 i wide.
Habit, habitat, and distribution.-We have one collection by H. V.
Smith (Smith 64485) obtained at the Rifle River Recreation area,
Lupton, September 29, 1961.
Observations.-The distinctive features of the above collection are
the viscid pileus with a separable pellicle and ferruginous-red colors except for the yellow margin, and the pores staining olive yellowish. In
Melzer's revived bits of hymenial tissue are greenish to bluish black.
When hymenial tissue is revived in KOH much bright yellow pigment
diffuses through the mount. According to Dick and Snell the reticulum
is brown to black on drying. This could be caused by the specimen
standing too long before being dried.
The following description is of a variant from the Huron Mountains: J. Ammirati 2004.
Pileus 10 cm broad, broadly convex, subviscid to viscid, glabrous,
vinaceous-red over the disc ("Pompeian-red" to "carmine"), margin paler
vinaceous with a distinct yellow undertone and extreme edge yellowish.
Context white tinted pinkish, unchanging when cut, odor pungentfungoid, taste pleasant; when dried pallid-buff.
Tubes lemon-yellow, shallowly depressed, unchanging; pores small,
yellow, staining light cinnamon.
Stipe 10 cm long, 2 cm at apex, 3.5 cm at base, clavate, solid,
whitish within or near cortex pinkish red; surface with a whitish reticulum over upper portion, base pallid with streaks of cinnamon to pinkish
cinnamon, apex cinnamon to pinkish cinnamon beneath the reticulum.
Spores 12-15 X 4-5.5 11, smooth, apex lacking a pore or thin spot;
shape in face view fusoid, in profile elongate-inequilateral, color revived
in KOH pale olive-yellow, in Melzer's long retaining a blue-gray shadow
(weakly amyloid), wall about 0.2 u thick.
Basidia 4-spored, 8-11 g in diameter, clavate, hyaline to yellowish
in KOH or Melzer's. Pleurocystidia absent. Cheilocystidia mostly
basidiole-like or weakly fusoid-ventricose to an obtuse apex.
Tube trama of the Boletus subtype, mounts of hymenophore giving
off a yellow pigment in KOH. Pileus cutis a tangled layer of more or
less appressed gelatinous hyphae but in places some indications of a
trichodermial structure visible, hyphal ends tubular to clavate and up to
7 J broad at apex, hyphae 4-6 # broad and gelatinous, with a strong
fleeting-amyloid reaction in Melzer's, and in this medium the hyphal tips
with yellowish content, the layer beneath the cutis orange-ferruginous in