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

LECCINUM

213

Subsection ALBELLA Smith, Thiers, & Watling
Mich. Bot. 6:116. 1967
Pileus epicutis in the form of a trichodermium of elements more or
less fused into an epithelium by the 2-6 distal cells of the individual
hyphae becoming so closely packed as to obscure the hyphal structure
of the layer; the young tubes never truly yellow.
Type species: Leccinum albellum.
KEY TO SPECIES
1. Pileus yellow at first............................ see L. luteum
1. Pileus yellow-brown to fuscous or whitish...................... 2
2. Context in stipe apex not staining when cut.... L. albellum and variants
2. Context staining gray and finally blackish................L. griseum
109. Leccinum albellum (Peck) Singer
Mycologia 37:799. 1945
f. albellum
Boletus albellus Peck, Rept. N. Y. State Mus. 41:149. 1889.
Ceriomyces albellus (Peck) Murrill, Mycologia 1:145. 1909.
Pileus 3-6 cm broad, at maturity convex to obtuse, becoming
broadly convex to plano-convex or remaining pulvinate, moist to dry,
apparently not becoming viscid or subviscid when wet or old, smooth,
occasionally appearing pitted with age, glabrous to subvelutinous to
somewhat pruinose at times when young, appearing glabrous in age,
sometimes remaining subvelutinous, frequently becoming rimose areolate
with age, whitish to pale pinkish buff to pale olive-buff to pallid, sometimes yellowish during all stages of development, margin incurved but
not appendiculate, decurved or finally spreading, entire. Context 1-1.5
cm thick, white, unchanging when injured, odor and taste not distinctive.
Tubes broadly and typically deeply depressed when young, becoming more broadly depressed in age, white when young, becoming
more or less olive-buff in age, up to 10 mm deep; pores angular, less
than 1 mm broad, pallid, unchanging or darkening only slightly in age.
Stipe 5-8 cm long, 7-11 mm broad at apex, subequal to tapering
toward the apex, dry, white to pale olive-buff during all stages of development, when young appearing subtomentose to appressed-fibrillose,