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

BOLETUS

307

fusoid-ventricose with subacute apex, hyaline in KOH and Melzer's,
smooth, thin-walled. Cheilocystidia 23-34 X 6-11 g, subfusoid, content
yellow in KOH, edge of tube composed mainly of clavate basidioles with
yellow content. Caulocystidia 33-56 X 9-15 u, clavate, ovate-pedicellate
or fusoid-ventricose, thin-walled, either hyaline or with bright yellow
content as revived in KOH.
Tube trama typical for the genus: the hyphae somewhat gelatinous
as revived in KOH. Pileus cutis of appressed-interwoven hyphae 5-9 j
wide, mostly tubular but apical cell tapered to a flexuous tip, walls thin
and smooth to minutely ornamented, the roughness hyaline, content
orange-ochraceous and homogeneous in Melzer's, hyaline to weakly
yellowish in KOH. Hyphae of subcutis and adjacent context hyphae
orange-ochraceous in Melzer's. Clamp connections absent (for all practical purposes-only 1 clamp seen).
Habit, habitat, and distribution.-Gregarious under hemlock,
Canyon Lake, Huron Mountains, Marquette County, August 10-13,
1968, J. Ammirati 2188 and A. H. Smith 76005. Type, Ammirati 2188.
Observations.-This is a very robust species with a much more
bulbous stipe and darker pileus than in B. pallidus to which it is otherwise related. Also it occurs under hemlock instead of oak or other
hardwoods. B. alutaceus Morgan also appears closely related but is
distinct in having smaller spores, and its context does not stain blue
when cut.
163. Boletus badius Fries
Elench, Fung. p. 126. 1828
Xerocomus badius (Fries) Kuhner ex Gilbert, Bot. Ser. 17, fasc. i-iv:195. 1926.
Boletus castaneus badius Fries, Syst. Mycol. 1:392. 1821.
Illus. Pls. 119-20.
Pileus 3-10 cm broad, pulvinate to convex becoming broadly convex or nearly plane, in moist weather surface viscid to thinly glutinous
but soon dry and unpolished, in age at times somewhat pruinose;
yellow-brown to vinaceous-red ("terra-cotta") when young, becoming
darker yellow-brown to chestnut or bay, sometimes slightly olive-tinted
(color rather variable). Context whitish young, soon yellow near the
tubes, pinkish under the cutis, staining weakly vinaceous when cut in
the area above the stipe, rarely bluish when injured; odor slight, taste
sour to mild, with FeSO4 dull bluish green, with KOH on tubes golden
brown; NH40H olive around the spot of application of the drop.