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

BOLETUS

337

Basidia 4-spored, 18-27 X 6-8 u, clavate, yellowish to hyaline in
KOH and Melzer's. Pleurocystidia 28-42 X (6) 7-11 i, narrowly fusoid
to fusoid-ventricose, often only the neck projecting, neck often tapered
to an acute apex, content hyaline in KOH. Cheilocystidia similar to
pleurocystidia but content more ochraceous-brown. Caulocystidia 36-50
X 12-20#u, clavate to fusoid-ventricose or vesiculose, thin-walled,
smooth.
Tube trama bilateral (the Boletus type), all hyphae thin-walled,
smooth, and hyaline. Pileus cuticle a trichodermium (?) but soon collapsing, the hyphae 3-6 u wide, sparingly branched, the cells tubular and
elongate, hyaline in KOH fresh and ochraceous as revived, smooth or
with a gelatinous sheath, the end-cells somewhat cystidioid-slightly enlarged near apex and tapered to the apex, in semidecumbent fascicles;
subcutis of hyphae with orange to orange-brown content in Melzer's (the
gelatinous layer paler). Clamp connections absent.
Habit, habitat, and distribution.-Under aspen, Crooked Lake,
Barry County, July 15, 1966, Samuel Mazzer and A. H. Smith 72955.
Observations.-The terminal cells of the cuticular hyphae distinguish this species from B. vermiculosus. They are narrower and more
cystidioid. The odor of the dried material was described by a biochemist
as that of boiled urine. The viscid pileus is an added distinctive feature.
181. Boletus vermiculosoides Smith & Thiers, sp. nov.
Illus. Pls. 134-35.
Pileus 4-12 cm latus, late convexus demum late depressus, siccus,
impolitus, sordide ochraceus demum pallide spadiceus. Contextus
citrinus tactu caeruleus. Tubuli 1 cm longi, pallide olivacei tactu caerulei; pori 2-3 per mm, spadicei. Stipes 4-9 cm longus, 1-2 cm crassus,
sursum olivaceo-pallidus, deorsum sordide brunneus. Sporae 9-12 X
3-3.5 M. Specimen typicum in Herb. Univ. Mich. conservatum est; prope
Hartland, August 30, 1966, legit Smith 73286.
Pileus 4-12 cm broad; convex, expanding to broadly convex or
finally slightly depressed on the disc, sometimes nearly flat; surface
dry, dull, unpolished, obscurely fibrillose at first in some, when perfectly fresh dull to bright yellow and soon becoming snuff-brown to
bister, rather dingy brown in age and occasionally somewhat mottled,
spotting darker brown where bruised, margin incurved at first, rarely
with lobes produced by localized growth. Context thick, rigid and firm,
lemon-yellow young fading to pallid yellow, staining blue to somewhat