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

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THE BOLETES OF MICHIGAN

beadlike droplets. Hyphae of subcutis merely yellowish in Melzer's but
some with irregular gelatinous material coating the surface. Hyphae of
the context next to the subcutis in part with orange to red content as
revived in Melzer's. Clamp connections absent.
Habit, habitat, and distribution.-Scattered under birch and aspen,
northwest Montmorency County, July 24, 1967, Smith 74630.
Observations.-The distinctive features of this variety are the
whitish pileus which when bruised become brown-spotted, the gradual
changes of the color finally to sordid alutaceous, the lack of a preliminary red color-change before the context stains fuscous when it is cut,
the wide, ornamented, cuticular hyphae very similar to those of L.
insigne, and a fair number of fusoid-ventricose caulocystidia among the
clavate to mucronate individuals. This variety fruits when L. insigne is
abundant, and the two maintain their identity even when growing in the
same local area. As successive fruitings were observed apparently from
the same mycelia the lack of red pigment cannot be attributed to a
chance failure of the pigment to develop.
Material examined.-Montmorency: Smith 74363, 74630, 74661,
74759, 75247.
80. Leccinum sublutescens Smith, Thiers, & Watling
Mich. Bot. 5:139. 1966
Pileus about 7 cm broad, convex, margin appendiculate, surface
dry and conspicuously areolate from the separation of the cutis, orangecinnamon and drying orange-brown, the pallid context showing in the
cracks. Context when cut slowly yellowish in both pileus and in the
stipe-apex, in the apex of the stipe soon pale vinaceous-buff, dull
pinkish tan downward, the lower two-thirds white and remaining so even
when dried.
Tubes about 1 cm long, depressed around the stipe, white becoming dull cinnamon in drying; pores small, round, pallid at first,
staining ochraceous when lightly bruised and this progressing to olivaceous.
Stipe about 8 cm long, about 1 cm thick, nearly equal, solid, for
color changes see under context above, surface whitish beneath a fine
sparse blackish ornamentation which fades upward to the pallid only
faintly ornamented apical region.
Spores 12-15 X 3-4.5,, narrowly subfusoid in face view, narrowly
inequilateral in profile, smooth, pale ochraceous in KOH, pale tan in
Melzer's.