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

LECCINUM

133

hyphae as well as in those in the adjacent context as revived in Melzer's,
and the dark color of the fresh pileus. The olive FeSO4 reaction may
also be significant. It appears to be close to L. murinaceo-stipitatum, but
the subiculum hyphae of the stipe ornamentation are not colored as
they are in that species, and the color of the pileus is bluish fuscous,
not dark cinnamon-brown. No incrusting pigment was noted on the
cuticular hyphae of L. uliginosum.
In the dried basidiocarps of L. uliginosum the lower part of the
stipe dried pallid to yellowish. The sterile band forming the margin of
the pileus almost disappeared in the process of drying. L. obscurum has
brownish bands of incrusting pigment on at least some of the cuticular
hyphae.
61. Leccinum subspadiceum Smith, Thiers, & Watling
Lloydia 31:263. 1968
Illus. P1. 66.
Pileus 8-15 cm broad, convex, expanding to broadly convex, margin exceeding the tubes and the sterile portion becoming crenate, surface
dry and unpolished, color "bister" (a medium date-brown) to "snuffbrown" (a pale date-brown) when young, when old evenly snuff-brown,
a few with darker streaks. Context pallid, in buttons staining avellaneous
to fuscous directly in older ones, slowly dull lilac above the tubes and
then darker, with FeSO4 pale gray; odor and taste not distinctive.
Tubes depressed around the stipe, 1-2 cm deep, pallid becoming
dark dingy brown; pores small, "cinnamon-buff" when immature and
color not changing much in age, when lightly bruised staining olive, if
severely bruised soon fuscous.
Stipe 10-18 cm long, 1-2 cm thick at apex, solid, streaked yellow
in old specimens and also staining blue, yellowish as dried, in young
stipes merely watery streaked and soon staining blackish; surface with
dull yellow-brown ornamentation to near the pallid apex, finally darkening to blackish.
Spore deposit dingy olive-brown on the debris around the basidiocarps (none obtained on white paper); spores 13-16 X 4.5-5.5 (6),,
smooth, some with a thin spot at apex, wall slightly thickened elsewhere
(0.5,j); shape in face view subfusiform to fusiform, in profile ventricose
and inequilateral to somewhat inequilateral, dingy ochraceous in KOH or
Melzer's.