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

BOLETELL US

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206. Boletellus russellii (Frost) Gilbert
Bolets p. 107. 1931
Boletus russellii Frost, Bull. Buff. Soc. Nat. Sci. 2:104. 1874.
Ceriomyces russellii (Frost) Murrill, Mycologia 1:144. 1909.
Boletogaster russellii (Frost) Lohwag, in Handel-Mazzetti, Symb. Sin. 2:56. 1937.
Illus. P1. 151.
Pileus 3-8 (13) cm broad, hemispheric to convex with a strongly
incurved margin, expanding to broadly convex but rarely nearly plane or
shallowly depressed; surface dry, subtomentose to tomentose, occasionally appearing squamulose, becoming areolate with the tomentum of the
areolae aggregated into obscure tufts, colored buffy brown to brownish
yellow or olive-gray, at times, however, browner ("Isabella color" to
"buffy brown" to "vinaceous-russet" to "tawny-olive"), at times redder
("cinnamon-brown" to "rufous"-Kauffman), yellow context showing
between the areolae, sterile margin usually present. Context up to 2 cm
thick, yellow to pallid-yellow, often avellaneous around wormholes, unchanging when bruised; taste mild, odor none.
Tubes deeper than thickness of context, adnate becoming depressed around the stipe, often extending for short distances down the
stipe as lines, yellowish olive to olive-green ("orange-citrine" to "citrine"
to "empire-yellow"), unchanging or brighter yellow when bruised; pores
large (1 mm or more wide, angular, dissepiments thin).
Stipe 10-18 cm long, 1-2 cm thick, equal or evenly enlarged
downward, often curved at the base, solid, firm, flesh yellow, covered
overall with coarse lacerate reticulation, surface including reticulation
dull red ("Hays-russet" to "brick-red" to "testaceous"), often viscid near
the base but no gelatinous veil present.
Spore deposit dark olive; spores 15-20 X 7-11,, in face view elliptic, in profile view obscurely inequilateral, longitudinally- striate with
deep grooves or wrinkles in outer wall and with a cleft in the wall at the
apex, bister in KOH, in Melzer's somewhat dextrinoid.
Basidia 3440 X 10-15 j, broadly clavate, hyaline in KOH,
yellowish in Melzer's. Pleurocystidia scattered to abundant, 50-70 X
9-15 /, hyaline in KOH, occasionally with melleous content, yellowish
in Melzer's. Cheilocystidia similar to the pleurocystidia, fusoid-ventricose, smooth, thin-walled, apex subacute, inamyloid both as to wall and
content.
Tube trama gelatinous and divergent, hyphae hyaline in KOH,
yellowish in Melzer's. Pileus trichodermium with the upper cells of the