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

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THE BOLETES OF MICHIGAN

8. Pileus dark blackish to dark olive-brown; spores 4-5 j. wide.................. (but see B. aereus of Europe also) B. variipes var. fagicola
8. Pileus dull tan, smoky brown or crust-brown, typically becoming
strongly areolate..................... B. variipes var. varipes
Stirps GERTRUDIAE
196. Boletus gertrudiae Peck
Bull. N. Y. State Mus. 150. 1911
Pileus 5-12 cm broad, broadly convex, fleshy, glabrous, soft, dry
or nearly so, orange-yellow or brownish yellow, rarely bright yellow;
context white, unchangeable. Tubes long, bright yellow when young,
brownish yellow when mature, adnate or but slightly rounded at the
stipe, pores minute. Stipe rather long, equal or nearly so, solid, glabrous,
yellow above, white below, white within or sometimes more or less
yellow within the upper part.
The above data are from the original description. The following
details are from a study of the type:
Spores 13-17 X 4-5.5 p (17-25 X 7.5-12, ), smooth, lacking an
apical pore; color in KOH weakly ochraceous, in Melzer's yellowish to
pale tawny; shape in face view subfusiform, in profile somewhat inequilateral (large spores oblong-angular to broadly fusoid and with the wall
1-2, thick), wall in normal spores 0.2-0.3 p thick, no positive amyloid
reaction of any kind present.
Basidia 4-spored. Pleurocystidia and cheilocystidia not observed
because of the poor preservation of the basidiocarp. Tube trama of
hyphae 4-8 p wide, not amyloid in any part. Pileus cuticle a trichodermium with the apical cells of the elements clavate to cystidioid and
arranged in a loose palisade, hyaline in KOH, weakly yellow in Melzer's,
gelatinizing in age, no positive amyloid reaction of any kind noted.
Hyphae of subcutis with ochraceous content in Melzer's. No clamp
connections observed (but hyphae poorly preserved).
The tissues of the type are filled with small spores possibly of one
of the Fungi Imperfecti. The spore size given by Peck covers both abnormal and "normal" spores in part. The spore abnormality here is
exactly parallel to that found for Tylopilus sordidus in that the wall
thickens greatly, some of the spores are almost fusoid-ventricose, and a
tendency to angularity is present. Since this has been a feature of all
collections of T. sordidus, it should be used as a tentative identification