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

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THE BOLETES OF MICHIGAN

woolly squarrose to subimbricate scales more erect toward the disc;
color "deep vinaceous" or "Pompeian-red" and "Isabella color" fibrils,
fading in age (vinaceous-red to pale tan with olive-yellow fibrils). Context whitish to yellowish in the pileus, readily staining blue when cut;
odor none, taste mild.
Tubes yellow, often tinged with reddish brown, staining blue
where injured, eventually becoming yellowish brown or reddish brown
all over, depressed around the stipe, 11-16 mm deep; pores yellow,
medium to large, irregular, angular, forming a distinctly convex lower
surface.
Stipe 6-14 (18.5) cm long, 8-15 mm thick, tapering upward at
first, rarely subbulbous or tapered downward, at times nearly equal,
solid, white or pallid, often with a red belt near apex ("Pompeian-red"
or lighter), becoming sordid pinkish, subfibrillose to fibrous, rarely with
an annular remnant from the veil, usually smooth.
Spores 16-20 (23) X 7.5-9.5 uA, longitudinally ridged by thin wings
arranged in a slightly spiraled pattern, apex with a small often indistinct
pore.
Basidia 22.5-50 X 9.5-17 /, 2- to 4-spored. Cystidia fusoid, mucronate, of ampullaceous to ampullaceous-capitate form, hyaline, brittle,
24-50 X 5-15 p. Tube trama bilateral with more colored mediostratum
and looser divergent lateral strata, the hyphae lacking clamps; outer
layer of veil of hyaline semiopaque, long-cylindric irregularly interwoven,
thin-walled hyphae 4-7 u wide, the terminal cells slightly tapered to an
obtuse tip or abruptly broadly rounded or subcapitate.
Chemical reactions: KOH on context yellow changing to brown,
pileus surface olive-yellow becoming maroon; NH40H on the surface
olive-yellow; FeSO4 on context green; with aniline negative.
Habit, habitat, and distribution.-In various kinds of woods, from
open pine-oak to dense tropical hammocks frequently on the bases of
trees (pine and oak), May to November, southern. As yet not found in
Michigan, but to be expected possibly in the southwest corner of the
state.
Observations.-Most of the data presented here are taken from
Singer (1945) and Coker and Beers (1943). In the dried material we have
studied, the spores are dingy yellow-brown in Melzer's (not dextrinoid),
the ribs of the spore are as Singer described them, and we found no
amyloid reactions of any degree on the spores or hyphae of the basidiocarps.