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

LECCINUM

191

Stipe 5-11 cm long, 1-1.7 cm at apex, more or less equal, crooked
at base, finely ornamented with brown to dark gray squamules and
points, solid, pallid within but wood-brown around the wormholes.
Spore deposit dark yellow-brown (bister); spores 13-16 X 4-5.5 I,
smooth, more or less fusoid to subfusiform in face view, elongate-inequilateral in profile, the suprahilar depression distinct, ochraceous in KOH,
pale tan to ochraceous in Melzer's, wall thickened somewhat (-0.5 It).
Basidia 4-spored, 20-24 X 9-12 p, often with a large hyaline oil
drop. Pleurocystidia not observed. Cheilocystidia fusoid-ventricose,
28-42 X 8-12 g, neck long and often crooked, apex subacute, with
hyaline to yellowish content. Caulocystidia with a filamentous elongated
neck, ventricose part with bister content revived in KOH. Pileus trichodermium of hyphae 4-8 p wide, with smoky ochraceous to brown content in KOH, the walls smooth to roughened and the cells readily disarticulating at maturity, the end-cells more or less tubular; wider hyphae
8-16 p broad also present and with some of the cells short (2 to 4 times
as long as wide), the end-cells bullet-shaped. Context hyphae hyaline to
yellowish in Melzer's. Clamp connections absent.
Habit, habitat, and distribution.-Gregarious under trembling
aspen, common but not recognized as a species until recently.
Observations.-The context stains gray to fuscous finally, and this
shows on the dried material. The base of the stipe dries olive-yellow. In
this species more than in any other the outline of the subcuticular
hyphae as revived in KOH appears blistered to eroded from irregular
gelatinization of the outer wall. In the trichodermial hyphae this may
also show but more often one observes the roughness in bands.
94. Leccinum huronense Smith & Thiers, sp. nov.
Pileus circa 10 cm latus, convexus, subviscidus, demum areolatus,
pallide spadiceus. Contextus pallidus, tactu griseus. Tubuli pallide lutei,
2 cm longi. Stipes circa 9 cm longus, 11 mm crassus, minute punctatus,
punctae demum atratae. Sporae 13-16 X 4-5 u. Specimen typicum in
Herb. Univ. Mich. conservatum est; prope Yellow Dog River, Marquette
County, August 21, 1967, legit Mrs. Ingrid Bartelli.
Pileus about 10 cm broad, broadly convex, margin even, surface
subviscid at maturity, matted-fibrillose and when dried very obscurely
areolate (scarcely spotted as dried and subcutis not showing), color pale
bister fresh, drying near "hair-brown" (brownish gray). Context firm,
pallid, cut surface staining grayish directly and the gray areas drying
gray, odor and taste not recorded.