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

BOLETUS

253

and lacking dextrinoid incrustations. Context of pileus and hymenophore crushed out in Melzer's exhibiting areas of blue-green color but the
pigment not localized under the microscope. Clamp connections none.
Habit, habitat, and distribution.-On a road bank, Harbor Springs,
Emmet County, July 1, 1967, Smith 74383.
Observations.-This species lacks the dextrinoid incrustations on
the hyphae of the subcutis characteristic of the variants around B. subtomentosus. Its distinguishing features are the ochraceous colors overall,
the rimulose-squamulose pileus, the short inflated cells in the hyphae of
the pileus trichoderm, the lack of pruina on the stipe, and presence of
blue staining on the hymenophore and to some extent on the context of
the pileus. Specimens of B. subtomentosus from Josserand in France did
not show short inflated cells in the cuticle of the pileus, and they did
show weakly dextrinoid incrustations on the lower cells of the trichodermial hyphae.
132. Boletus spadiceus Fries
Epicr. Syst. Mycol. p. 415. 1838
Suillus spadiceus (Fries) Kuntze, Rev. Gen. P1. 3(2):536. 1898.
Xerocomus spadiceus (Fries) Quelet, Fl. Myc. p. 417. 1888.
Xerocomus coniferarum Singer, Farlowia 2:297. 1945.
Pileus 5-11 (18) cm broad, convex becoming broadly convex,
sometimes nearly plane; surface dry and subtomentose to velvety, remaining so throughout its life or in dry seasons somewhat areolate, in
age often appearing somewhat matted-fibrillose under a lens, color "dark
olive-buff" to near "Isabella color" (olive to olive yellowish) but a reddish tinge gradually developing as an undertone and in age sometimes
reddish brown when wet, often merely some shade of dingy yellowbrown or dull reddish along the margin, margin not exceeding the tubes.
Context thick, soft, pallid-yellow with a reddish line beneath the cuticle,
bright yellow and finally pinkish around larval tunnels, rarely slightly
blue when bruised, odor none or very faintly pungent, taste mild;
NH4OH on cutis green to bluish green then changing to fuscous then to
reddish brown; FeS04 no reaction on the cuticle, context or stipe.
Tubes becoming depressed around the stipe, 1-2 cm long, yellowocher; pores large and angular (1-2 mm wide), pale yellow young, more
olive-yellow in age, staining bluish slightly when bruised.
Stipe 4-10 (12) cm long, 1-2.5 (3) cm thick, often narrowed
downward, with yellow mycelium around the base, pallid over apical