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

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THE BOLETES OF MICHIGAN

but smaller. Caulocystidia in patches, 25-35 X 8-12 /, clavate, thinwalled, rarely some fusoid-ventricose.
Tube trama of the Boletus subtype, all hyphae smooth and with
thin yellowish to hyaline walls revived in KOH. Pileus cutis a layer of
intricately entangled hyphae 5-15 wide, with many short cells (some
up to 20 / or more wide), hyphae very clearly defined in either KOH
or Melzer's, walls thin and smooth, content orange-brown in Melzer's,
yellow to ochraceous-orange in KOH, no pigment globules present in the
mounts; terminal cells cystidioid to clavate. Clamp connections absent.
Habit, habitat, and distribution.-Gregarious in an oak woods, Gun
Lake, Barry County, August 22, 1966, Smith 73128.
Observations.-This species is in the B. miniato-olivaceus group but
the red of the pileus fades quickly though the purplish red of the stipe
is persistent. The cutis of the pileus in this species is never a trichodermium-ample button stages were available for examination. The
spores are smaller than for B. miniato-olivaceus and the characteristic
pleurocystidia of the latter were not present. Also, in Peck's species the
tubes are deeper. The NH40H reaction of the pileus cuticle is unusual in
this group.
Material examined.-Barry: Mazzer 4224, 4230; Smith 73128
(type), 73200. Washtenaw: Smith 72538.
148. Boletus carminipes Smith & Thiers, sp. nov.
Pileus 5-10 cm latus, convexus, siccus, subtomentosus demum impolitus, subcinnamomeus vel sordide alutaceus. Contextus luteus tactu
caeruleus. Tubuli 4-6 mm longi, adnatae vel subdecurrentes, lutei tactu
caerulei; pori circa 1 mm lati, lutei. Stipes 5-10 cm longus, 1-3 cm
crassus, clavatus, sursum luteus, deorsum carmineus, pruinosus. Sporae
9-12 X 3-3.5 u. Specimen typicum in Herb. Univ. Mich. conservatum
est; prope Detroit, September 2, 1965, legit E. Kidd (Smith 72473).
Pileus 5-10 cm broad, convex, becoming broadly convex, surface
dry, plushlike at first but becoming unpolished, color dingy "Sayalbrown" to near "snuff-brown" or "bister" (dull cinnamon or redder
when young, becoming dingy yellow-brown in age, becoming slightly
rimulose but not areolate. Context pale yellow drying buffy pallid, almost instantly blue when broken, taste and odor not distinctive, FeSO4
slowly bluish, KOH on blue areas pale ochraceous-tan, on cuticle dark
yellow-brown.
Tubes short, 4-6 mm deep when context is 1-2 cm deep, adnate to
subdecurrent in a few finally slightly depressed, yellow but quickly blue if