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

LECCINUM

143

either within or on the surface, the surface with coarse black ornamentation in the form of points and squamules from button stages to maturity and from base to apex, with a cottony-fibrillose layer beneath this,
dry at base in young specimens.
Spore deposit dull yellow-brown ("snuff-brown"); spores 13-17 X
4-5 p, smooth, wall slightly thickened, in face view subfusiform, in profile very obscurely inequilateral, suprahilar depression broad and shallow, pale yellow-brown in KOH and not changing much in Melzer's.
Basidia 4-spored, 8-12 i broad, hyaline in KOH. Pleurocystidia
scattered, 30-40 X 8-12,, fusoid-ventricose, with dull yellow-brown
content when revived in KOH or in Melzer's, smooth, thin-walled.
Cheilocystidia 26-35 X 6-10 p, fusoid-ventricose to clavate, ochraceous
in KOH, soon gelatinizing in KOH. Caulocystidia 40-120 X 10-25 i,
clavate to fusoid-ventricose, content bister in KOH.
Cutis of pileus of tangled filaments, the hyphae with lemon-yellow
content in KOH when fresh, yellow to nearly hyaline when revived in
KOH and in Melzer's the content granular to homogeneous and yellowish (no pigment globules seen); the hyphae with cells tubular to somewhat inflated, mostly 6-11 p wide, some rather short, finally disarticulating, the end-cells tubular to either narrowly clavate or tapered to apex,
walls smooth to minutely asperulate. Context hyphae when revived in
Melzer's with orange to red content in some. Clamp connections absent.
Habit, habitat, and distribution.-Solitary to scattered in the hardwood forests of the state if birch is present. Not uncommon during
some seasons.
Observations.-This is one of the most distinctive species in the
genus by virtue of its pale rather dull colored pileus which typically
appears patchy in age from appressed aggregations of fibrils, the black
ornamentation covering the entire stipe except possibly the extreme
base, and the medium-sized spores. It is very close to L. testaceoscabrum. For further comment see that species.
Material examined.-Cheboygan: Smith 36390, 67225, 71535,
72744, 74305, 74454, 75401; Thiers 2688, 3094, 3374, 4258. Chippewa: Smith 71832, 71912, 71913, 72421, 72484; Thiers 3023, 2406,
3865, 3866, 4355. Emmet: Smith 71559, 71670; Thiers 622, 3073,
3529, 3729, 4279, 4386. Luce: Smith 36969, 37442, 50240, 72012,
74439; Thiers 3402. Mackinac: Smith 71902; Thiers 3354, 3618. Marquette: Bartelli 2173; Smith 6654, 72767. Montmorency: Smith 66998.