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

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THE BOLETES OF MICHIGAN

and subacute apex. Cheilocystidia 18-32 X 6-10 u, subfusoid to subcylindric, smooth, thin-walled, hyaline in KOH. Caulocystidia in the fascicles with basidia, 40-75 X 7-15 p and narrowly fusoid-ventricose neck
up to 20-30 p long, also some large clavate to mucronate cells present
which measure up to 20 u broad, content ochraceous-brown in KOH.
Pileus cuticle of hyphae 7-15 p wide, the cells more or less inflated, the end-cells clavate to subglobose, with hyaline to brownish
content in KOH and Melzer's. Subcutis of hyaline (in KOH), interwoven,
subgelatinous (revived in KOH) hyphae also hyaline in Melzer's. Context
hyphae 9-17 p wide and hyaline to yellowish as revived in Melzer's.
Clamp connections absent.
Habit, habitat, and distribution.-Along logging roads through hardwood forests, with young growth of Betula lutea in the vicinity, late
summer, Upper Peninsula, rare.
Observations.-This is the species as based on Singer's original description. Watling (1968) has discussed this problem and given an account based on specimens borrowed from the Komarov Bot. Institute
(LE) identified by Singer. In more recent accounts Singer (1967) described the pileus as very dark brown to grayish brown or blackish.
107. Leccinum subgranulosum Smith & Thiers, sp. nov.
Pileus 4-10 cm latus, late convexus, subsquamulosus vel areolatus,
pallide spadiceus. Contextus pallidus tactu subluteus. Stipes 7-11 cm
longus, 8-16 mm crassus, atrosquamulosus. Sporae 15-21 X 5.5-7.5 u.
Specimen typicum in Herb. Univ. Mich. conservatum est; prope Pellston,
July 2, 1967, legit Smith 74398.
Pileus 4-10 cm broad, obtuse to convex, in age broadly convex to
nearly plane, margin even to very obscurely crenate and not extended
significantly beyond the tubes; surface granulose-squamulose, in old pilei
minutely areolate as dried; a dull "snuff-brown" (dingy yellow-brown)
and approximately this color as dried. Context pallid, when cut slowly
becoming brownish, yellow just above the tubes, brownish in the apex of
the stipe.
Tubes whitish becoming bister (very dark yellow-brown) 1-1.5 cm
deep, nearly free from the stipe; pores small, pallid, staining ochraceous
and then brownish as bruised.
Stipe 7-11 cm long, 8-16 mm thick at apex, evenly and slightly
enlarged downward, solid, pallid within, brownish slowly in apex when
cut; surface covered by a fine blackish ornamentation above, squamules
coarser lower down; ground color and base of stipe whitish.