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

LECCINUM

193

Observations.-This is a distinctive species in this subsection because of the pale yellow tubes when young and the narrow spores. The
stipe does not become yellow as in L. flavostipitatum. The spores are
too narrow for L. subleucophaeum.
95. Leccinum proximum Smith & Thiers, sp. nov.
Pileus 3-7 cm latus, convexus, obscure fibrillosus demum glaber et
subviscudus, pallide spadiceus demum tarde ad centrum spadiceo-niger.
Contextus albus tactu tarde subgriseus. Stipes 4-9 cm longus 8-13 mm
crassus, atropunctatus vel squamulosus. Sporae 14-18 (20) X 4.5-6 i.
Specimen typicum in Herb. Univ. Mich. conservatum est; prope Onaway,
Michigan, legit N. J. Smith (A. H. Smith 63545).
Pileus 3-7 cm broad, convex becoming broadly convex or nearly
plane, surface glabrous to obscurely fibrillose at first and dry, becoming
glabrous and subviscid, color a dingy yellow-brown ("bister") when
young, "sepia" to "mummy-brown" on the disc (blackish brown) in age
or when dried, some pilei remaining paler in age. Context white, thick,
firm, becoming soft in age; unchanging when cut or very slowly grayish,
bluish on stipe and tubes as well as the context with FeSO4.
Tubes 8-12 mm deep, depressed around the stipe in age, adnate at
first, white, slowly grayish brown and as dried dull cinnamon-brown;
pores small round, whitish, when bruised staining yellow and then slowly
changing to snuff-brown or bister.
Stipe 4-9 cm long, 8-13 mm apex, nearly equal, solid, white
within, slowly staining vinaceous-gray when cut, except at base which
stained orange-buff slightly in one, surface ornamented with coarse
patches and points, the ornamentation brownish black on a pallid
ground color and retaining these colors or becoming paler in drying, no
bluish or greenish stains evident at any time.
Spore deposit chestnut-brown to "Prouts-brown"; spores 14-18
(20) X 4.5-6,, smooth, lacking an apical pore, shape in face view elongate-fusiform, in profile elongate-inequilateral; dull ochraceous-brown
(near pale snuff-brown) in KOH, not changing much in Melzer's.
Basidia 4-spored, yellowish to hyaline in KOH and yellowish in
Melzer's, 9-12, in diameter. Pleurocystidia scattered 46-52 X 8-12 i,
fusoid-ventricose with curved neck and acute apex, the neck about 3 p
in diameter, mostly hyaline in KOH. Caulocystidia 36-60 X 9-14 u,
mostly fusoid-ventricose to mucronate or clavate, content smoky brownish
in KOH, walls thin and smooth.
Pileus cuticle with a subcutis of interwoven, narrow (3-5 iu), subgelatinous, thin-walled, smooth hyphae giving rise to a poorly formed