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

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THE BOLETES OF MICHIGAN

70a. Leccinum cinnamomeum var. fibrillosum Smith &
Thiers, var. nov.
Pileus 6-12 cm latus, late convexus, siccus, rufo-fulvus vel fulvus,
fibrillose squamulosus. Stipes atropunctatus vel squamulosus. Sporae
13-16 X 3.5-5 p. Specimen typicum in Herb. Univ. Mich. conservatum
est; prope Brutus, Emmet County, July 12, 1968, legit Smith 75560.
Pileus 6-12 cm broad, broadly convex expanding to nearly plane,
margin appendiculate, surface dry and distinctly fibrillose-squamulose
from "tawny" to "ochraceous-tawny" squamules (having much the appearance of Agaricus subrufescens ), when dried dull cinnamon in color
and spotted from the squamules. Context pallid when cut but soon
staining reddish cinnamon and finally blackish and the latter persistent
in the dried basidiocarps, odor and taste not distinctive.
Tubes pallid when young, slowly dull brown by maturity but passing through an olive-gray stage; pores minute, pallid to olive-pallid and
when bruised staining olive-brown going to fuscous.
Stipe 9-11 cm long, 12-15 cm thick, equal, solid, context staining
as in the pileus; surface pallid with an overlay of black rather coarse
ornamentation, apex pallid.
Spores 13-16 X 3.54.5 (5)/, smooth, lacking an apical pore or
thin spot, shape in face view narrowly fusoid, in profile narrowly inequilateral, wall about 0.2 p thick, color in KOH ochraceous to weakly
yellow-brown, not appreciably changing in Melzer's.
Basidia 4-spored, 8-11 p broad at apex, clavate, hyaline in KOH
and merely yellowish in Melzer's. Pleurocystidia scattered, more or less
fusoid-ventricose, 28-46 X 8-13 p, apex subacute, hyaline in KOH, content often brownish as revived in Melzer's. Cheilocystidia 18-28 X
6-11,p, subfusoid, content yellowish revived in KOH. Caulocystidia 30-80
X 9-22 p, clavate or mucronate, content dingy yellow-brown in KOH,
wall thin and smooth, subiculum hyphae not colored.
Tube trama of weakly divergent hyphae with refractive septa,
hyphae 4-6 p wide, not obviously gelatinous in KOH. Pileus cutis of
appressed hyphae much as in L. insigne-some very wide (up to 25 j)
and their end-cells usually bullet-shaped, most hyphae 4-10 p wide and
tubular, the cells often disarticulating, content dingy yellow-brown in
KOH, walls smooth to minutely ornamented (roughened), in Melzer's
the content remaining homogeneous or more rarely becoming granular,
the cells mostly more than 4 times as long as broad. Hyphae of subcutis and adjacent context not highly colored in Melzer's. Clamp
connections none.