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

216

THE BOLETES OF MICHIGAN

KEY TO SPECIES
1. Spores 6-8 j in diameter.......................L. crocipodium
1. Spores 3.5-6.5 /1 wide.................................. 2
2. Pileus typically uneven to pitted; stipe reticulate and furfuraceouspunctate as well as resinous to touch............... L. rugosiceps
2. Pileus smooth to slightly rugulose or if pitted then the stipe ornamentation dry to the touch and never a reticulum...................... 3
3. Stipe ornamentation pallid becoming blackish in age; young hymenophore
pallid and pileus subviscid.......................... L. luteum
3. Stipe.ornamentation very fine and pallid to yellowish, rarely reddish and
scarcely changing in drying............................... 4
4. Pileus cutis a cellular layer appearing to be 2-4 cells deep....................................... see Boletus subglabripes
4. Pileus cuticle a disarranged hymeniform layer................................... see L. brunneo-olivaceum (not treated here)
111. Leccinum rugosiceps (Peck) Singer
Mycologia 37:799. 1945
Boletus rugosiceps Peck, Bull. N. Y. State Mus. 94:20. 1904.
Krombholzia rugosiceps (Peck) Singer, Ann. Mycol. 40:34. 1942.
Pileus 5-15 cm broad, convex, unpolished, dry to moist but not
viscid, uneven to rugulose or pitted, becoming areolate-rimulose in age
and then showing the white context in the cracks, orange-yellow to
yellow-ocher (duller) and finally some shade of crust-brown. Context
thick but thinner than the depth of the tubes, pallid yellowish but
slowly changing to dull reddish when cut or when bruised in at least
some specimens.
Tubes pale bright yellow at first, dingy ochraceous in age, 10 mm
or more deep at maturity, depressed around the stipe to free, not
changing color when bruised; pores small and round, less than 1 mm in
diameter.
Stipe 8-10 cm long, 2-3 cm thick, fleshy-fibrous, solid, surface
reticulate overall and furfuraceous-punctate from a resinous (to the
touch) covering, apex pale yellow, pallid-orange-yellow over the remainder from the punctate elements which in age become blackish on the
yellow ground color, yellow within, not staining blue anywhere.
Spores (14) 16-21 X 5-5.5 u, smooth, in face view fusiform, in
profile elongate-inequilateral, ochraceous revived in KOH, in Melzer's
pale tawny but some finally dark reddish brown overall or over the basal
half, the wall slightly thickened.