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

BOLETUS

227

Tube trama as revived in KOH parallel to subparallel, the outer
hyphae diverging slightly to the subhymenium. Pileus cuticle a collapsed
trichodermium of hyphae 4-8/ wide, thin-walled, smooth and at first
(as revived in KOH) with greenish yellow content, the elements
branched to some extent; hyphae of context 8-15 gt wide, thin-walled
and hyaline in KOH. Clamp connections none. Tissues of pileus and
hymenophore nonamyloid under the microscope.
Habit, habitat, and distribution.-Under pine (either red or white),
and to be expected throughout the pine region of the state, but to date
found most abundantly along the south shore of Lake Superior. Mrs.
Bartelli has collected it in quantity in the Marquette region.
Observations.-Mrs. Bartelli has collected a variant in which the
margin of the pileus is fertile, the sterile band-for which the species was
named-being absent. The Melzer's reaction on the spores is much like
that for B. amylosporus, only more pronounced.
Material examined.-Luce: Smith 72030, 72842. Marquette:
Bartelli 2156, 2157, 2284, 2425, 2517, 2525, 2529, 2540; Smith
67677.
Subsection PARASITICI (Singer), comb. et stat. nov.
Xerocomus section Parasitici Singer
Ann. Mycol. 40:43. 1942
Type species: Boletus parasiticus.
117. Boletus parasiticus Fries
Syst. Mycol. 1:389. 1821
Xerocomus parasiticus (Fries) Quelet, Fl. Myc. Fr. p. 418. 1888.
Illus. PI. 96.
Pileus 2-8 cm broad, convex becoming broadly convex; surface dry
and unpolished, appearing matted-fibrillose under a lens; color evenly
"tawny-olive" (dingy yellow-brown), or varying more toward olive
(buffy brown), with a narrow sterile margin incurved at first. Context
pale lemon-yellow, unchanging when cut, instantly orange-ochraceous in
KOH, with FeSO4 pale olive, KOH on cuticle of pileus dark orangebrown.
Tubes 3-5 mm deep or in age up to 1 cm, adnate to decurrent by
lines, or in age depressed around the stipe but still with decurrent lines,