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

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THE BOLETES OF MICHIGAN

Habit, habitat, and distribution.-Scattered under conifers, especially spruce, Cheboygan and Chippewa counties, August and September, Smith 77697 is the collection described.
Observations.-We have identified our material with Quelet's
species on the basis of the peppery (not acrid) taste, wide pores at
maturity, and their red color. On the basis of the cuticular hyphae in
the larger specimens, the species as we have described it is amply distinct from B. piperatus. In younger pilei of B. amarellus we found the
cuticular hyphae to be 8-15 u wide, and no disarticulation of cells was
noted. Our study has shown that there is considerable more diversity of
characters in the group than was previously supposed.
156. Boletus rubinellus Peck
Rept. N. Y. State Mus. 32:33. 1879
"Pileus at first broadly conical or subconvex, then expanded, subtomentose, red, becoming paler with age; tubes convex, adnate or somewhat depressed around the stem, rather large, subrotund, pinkish red
then sordid yellow; stem equal, smooth, yellow with reddish stains;
spores oblong,.0005'-.0006' long,.00016' broad; flesh of both pileus
and stem bright yellow.
"Plant about 2' high, pileus 1-2' broad, stem 1-2' thick.
"Ground in woods. Gansevoort, Aug."
The species belongs in the section Subtomentosi and is apparently
related to B. rubinus.
Data from the type:
Spores 12-15 X 3.3-4.5 (5) u, smooth, apical pore not visible,
color in KOH pale dull ochraceous, in Melzer's a large number soon
rather strongly dextrinoid, shape in profile somewhat inequilateralelongate, in face view subfusoid, wall about 0.3 p thick.
Basidia 24-32 X 8-10 /, 4-spored, clavate, content not distinctive
in either KOH or Melzer's. Pleurocystidia scattered to abundant, 34-62
X 7-12 u, fusoid-ventricose with neck elongated and apex obtuse to
subacute, wall thin and smooth, content not distinctive in either KOH
or Melzer's. Cheilocystidia and caulocystidia not studied.
Cuticle of pileus a tangled mass of hyphae 3-6 p wide, hyphae
tubular, thin-walled, smooth, end-cells tubular or nearly so, no short
cells evident, in KOH ochraceous from colored homogeneous content, in
Melzer's content homogeneous and dull orange-buff. Context hyphae
with orange-buff content in Melzer's. No clamps observed.