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

BOLETUS

301

but smaller. Caulocystidia-some resembling pleurocystidia but most of
them resembling the end-cells of the trichodermial hyphae of the pileus.
The cells 40-70 X 5-8 u and often flexuous, walls smooth and thin,
content not distinctive in KOH or in Melzer's.
Cuticle of pileus at first a trichodermium of upright hyphae but
this very soon collapsing, the hyphae 4-8. wide, the cuticle in age a
tangled mass of hyphae, their cells tubular, the walls thin and smooth
and the content orange-brown to orange-buff but fading on standing (all
in mounts in Melzer's), in KOH the content ochraceous. Context hyphae
(in Melzer's) orange to orange-red, in KOH hyaline and granular
("coloidal"). No clamps observed.
Habit, habitat, and distribution.-Gregarious near spruce, Lower
Falls of the Tahquamenon River, Chippewa County, August to September, Smith 75830, 77910(type), 78050. The type was from Cheboygan
County.
Observations.-This species differs from B. rubritubifera and B.
rubinellus in the olive tone which the spores assume when revived in
KOH and in the very rare pleurocystidia. The color of the pileus generally has less red in it than the other species-especially in the immature
stages.
159. Boletus piperatoides Smith & Thiers, sp. nov.
B. piperatus similis sed pori tactu caerulei; sapor tarde subacris.
Specimen typicum in Herb. Univ. Mich. conservatum est; prope Otis Lake,
Barry County, August 19, 1966, legit S. Mazzer (Smith 73092).
Pileus 3-6 cm broad, obtuse becoming plane or finally the margin
uplifted, surface soft (like kid gloves), subviscid, color tan to dull
orange-cinnamon, margin near cinnamon-buff. Context thick, pale pinkish buff, when cut slowly staining dull blue, taste slowly peppery (not as
"hot" as in B. piperatus) with guaiac slowly blue, with FeSO4 bluish
gray, with KOH a yellow pigment dissolves into the mount, the reaction
on the pileus cutis soon going to brownish.
Tubes up to 1 cm long, decurrent, dull ochraceous, staining dingy
inky blue when bruised; pores near "snuff-brown" (yellow-brown), staining bluish, 2-3 per mm, splitting when the pileus is broken downward.
Stipe 4-6 cm long, 4-6 mm thick, solid, honey-color above,
lemon-yellow in the base; base coated with lemon-yellow mycelium, surface above naked or nearly so and dingy yellowish brown, basal portion
lemon-yellow as dried both in the interior and over the surface including
the mycelium.