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

LECCINUM

189

or only slightly inflated but tapered to apex, with no tendency to produce short cells. Clamp connections absent.
Habit, habitat, and distribution.-Scattered in mixed woods, birch
present, south shore of Lake Superior in Luce County and along the St.
Mary's River near Goetzville, Mackinac County, August, rare.
Observations.-The pale caulocystidia with the neck often corkscrew-like, the slimy-viscid olive pileus, the pattern of color changesparticularly the change to olive in the stipe apex-in addition to the
wood-brown stains, all distinguish this species from others in the section.
The color of the spore deposit is about like that of Boletus affinis Peck.
In view of the generally dull yellow-brown spore deposit of species of
section Scabra it is not at all surprising to find a species in which this
color is accentuated. We certainly would not think of erecting a genus
parallel to Xanthoconium for it.
The caulocystidia are peculiar in that they exhibit the same character, in a way, as the somewhat coiled pileocystidia in a number of
species of Crepidotus.
92. Leccinum subleucophaeum Dick & Snell
Mycologia 52:453. 1960
Illus. PI. 83.
Pileus 3-10 (15) cm broad, convex to pulvinate, expanding to
broadly convex or nearly plane, rarely with a low obtuse umbo, dry and
typically obscurely matted-fibrillose with dark appressed hairs or fibrils,
becoming almost glabrous in age, margin even, often blackish over disc
and grayish toward the margin, in age becoming dingy yellow-brown at
times. Context thick, white, changing slowly to gray when cut, slowly
bluish gray with FeSO4, odor and taste mild.
Tubes adnate becoming deeply depressed, white when young, becoming avellaneous to wood-brown, 10-20 mm deep, when mature;
pores small (about 2 per mm), round, pallid, staining yellowish and then
brownish slowly after injury, orange-brown with KOH, blue with FeSO4.
Stipe 5-10 (15) cm long, 10-20 mm thick at apex, clavate becoming equal, white beneath a coating of blackish scabrous points,
staining blue to greenish below where handled, solid, white within and
typically staining pinkish and then avellaneous to wood-brown when cut,
often with a blue line in a longitudinal section.
Spore deposit near cinnamon-brown when moist, near dingy cinnamon dried; spores 13-16 (19) X 4.5-6.5 (7) g, smooth, in face view