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

LECCINUM

159

77. Leccinum imitatum Smith, Thiers, & Watling
Mich. Bot. 5:136. 1966
Pileus 6-10 cm broad, convex to broadly convex or finally nearly
plane; surface dry and matted-fibrillose, becoming more conspicuously
fibrillose in age, color when young evenly dingy rufous, becoming duller
and in age or when dried dull cinnamon-brown, margin appendiculate at
first. Context white, firm becoming soft, slowly bluish gray to fuscous
when cut, odor and taste not distinctive, greenish with FeSO4.
Tubes pale yellow in young specimens with the pores dull yellowbrown (bister), depressed around the stipe in age, 1.5 cm long in ventricose part, becoming grayish to near wood-brown at maturity; pores
small, round, concolorous with the sides in age.
Stipe 6-12 cm long, 1-2 cm thick, equal to evenly enlarged downward, solid, white, within finally staining blackish when cut or in drying,
weakly yellowish in basal area in some as dried, staining blue in base
when fresh; surface whitish with blackish ornamentation to apex.
Spore deposit dull rusty brown ("cinnamon-brown"); spores 14-18
X 5-7 p, smooth, wall thickened, in KOH dingy ochraceous to brownish
ochraceous, in Melzer's dingy yellowish to pale tan, rarely a few dextrinoid; shape in face view subfusiform, in profile somewhat inequilateral, suprahilar depression broad.
Basidia 23-28 X 10-12 u, 4-spored, short-clavate, hyaline to yellowish in both KOH and Melzer's. Pleurocystidia abundant, 38-52 X
10-15 p,, fusoid-ventricose, the apex subacute to obtuse, wall thin and
smooth, content hyaline in some both in KOH and Melzer's. Caulocystidia
clavate to a few mucronate or fusoid-ventricose, 9-22 /u wide, content
bister in KOH, walls thin and smooth. Tube trama of hyphae somewhat
divergent from a central strand.
Pileus cutis a tangled layer (possibly a collapsed trichodermium) of
hyphae 4-9 u wide, the end-cells usually tapered somewhat and rarely
inflated in the midportion; in KOH the content orange-brown to dingy
pale ochraceous-brown and homogeneous to granular when revived in
Melzer's the content reddish and homogeneous at first but slowly becoming paler and somewhat granular; walls thin and smooth. Context
hyphae next to the cutis with orange to orange-red content as revived in
Melzer's. Clamp connections none.
Habit, habitat, and distribution.-Under aspen, Pellston, the hills
west of town, June 21, 1963, Smith 66706.