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

LECCINUM

153

mucronate, or broadly fusoid with a short neck and subacute to obtuse
apex, content ochraceous in KOH and evenly distributed.
Tube trama typical for the genus, some laticiferous elements with
ochraceous content (in KOH) present. Pileus cutis of hyphae 4-10 (12) j
broad, tubular to somewhat inflated, cells frequently disarticulating but
usually 4 times or more as long as broad (but secondary septa may form
in some terminal cells thus producing shorter segments), wall smooth or
minutely rough as in L. insigne, content ochraceous in KOH and more
yellow-brown in Melzer's but not forming globules in the latter medium
or a globule forming slowly in an occasional cell. Hyphae of subcutis
and adjacent context yellow to orange in Melzer's. Clamp connections
none.
Habit, habitat, and distribution.-Scattered under aspen and birch
in a swampy area, lower Maple River, Emmet County, July 12, 1968,
Smith 75559.
Observations.-This species is paler than typical L. aurantiacum
and for all practical purposes lacks the formation of globules in the
cuticular hyphae as the latter are mounted in Melzer's. The stipe ornamentation remains pallid longer than in L. insigne var. insigne and is
often rather bright orange-brown for a long time. The color change to
reddish cinnamon separates it from the L. insigne group but old basidiocarps do not always show it.
Stirps INSIGNE
KEY
1. Caulocystidia (or many of them) with a caplike wall thickening at the
apex..................................... L. areolatum
1. Not as above....................................... 2
2. Pileus dull white to weakly grayish but not spotting brown.... L. broughii
2. Pileus more highly colored or becoming so when mature, sometimes spotted brown where bruised....................... 3
3. Pileus whitish spotting brown when bruised and in age becoming more or
less cinnamon-buff overall........... L. insolens var. brunneo-maculatum
3. Not spotting as in above choice............................ 4
4. Pileus rusty red to liver color; many cuticular hyphae in Melzer's having
the content rounding into pigment globules (see L. sublutescens also).... 5
4. Not as above.................................... 6
5. Pores cinnamon-brown young; spores 4-5, broad........................................... L. subtestaceum var. subtestaceum
5. Pores pallid to grayish; spores 3-4 /J wide (see L. sublutescens also)................................. L. subtestaceum var. angustisporum