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

LECCINUM

157

in age becoming obscurely areolate, sterile margin soon broken into
segments. Context white, changing to vinaceous-gray to slate color, soon
blue in base of stipe; odor and taste mild; with FeSO4 greenish blue.
Tubes whitish becoming gray to wood-brown, 1-2 cm long, depressed around the stipe in age, adnate at first, slowly vinaceous-gray
when cut; pores small round and "cinnamon-brown" when young, paler
in age.
Stipe 7-12 cm long, 2-3 cm thick at apex, equal or evenly enlarged downward, solid, white within, staining vinaceous-slate when cut,
bluish in and around the base in some; surface white but overlaid with a
black reticulate scabrous coating of lines and points.
Spores 11-15 X 5-5.5 /, smooth, apical pore lacking, walls only
slightly thickened, shape in face view subfusoid, in profile inequilateralelongate, brownish ochraceous when revived in KOH, in Melzer's ochraceous-tan (rather pale and dingy).
Basidia 4-spored, clavate, 22-27 X 8-11 p., hyaline to yellowish in
KOH. Pleurocystidia-none seen. Cheilocystidia 23-24 X 5-9 gu, subfusoid
with obtuse apex to clavate, dingy ochraceous in KOH. Caulocystidia
mostly fusoid-ventricose or clavate-mucronate, some remaining clavate,
thin-walled, smooth, content dark smoky brown as revived in KOH.
Pileus cutis of appressed interwoven hyphae 4-10 (12) u wide, the endcells mostly narrowly clavate to cylindric, tips obtuse, content in KOH
orange-brown to orange-ochraceous, in Melzer's the content breaking up
into pigment globules or masses so that end-cells often simulate a tube
filled with beads. Context hyphae lacking a highly colored content when
revived in Melzer's. Clamp connections absent.
Habit, habitat, and distribution.-On sandy soil under aspen, late
summer, rarely collected to date.
Observations.-This species differs from L. insigne in having the
dark brown pores when young and in the pigment globules observed
when cuticular hyphae are mounted in Melzer's either on fresh or dried
material. It lacks a red color-change before the changes progress to
fuscous, and has dark brown pores; both features distinguish it from L.
aurantiacum. The dark liver-red pileus distinguishes it from both L.
aurantiacum and L. insigne.
76a. Leccinum subtestaceum var. angustisporum Smith &
Thiers, var. nov.
A typo differt: Sporae 14-18 X 3-4 (4.2) g; pori grisei. Specimen
typicum in Herb. Univ. Mich. conservatum est; prope Hardwood Lake,