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

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the outline of the cell, these end-cells not organized into a palisade, in
KOH the hyphae of the layer seen to have numerous amorphous refractive yellowish particles scattered through the layer, or the hyphal walls
with yellowish to hyaline roughening irregularly distributed; in Melzer's
much finely divided, particulate, weakly dextrinoid material present between the hyphae. Hyphae of the context and subcutis lacking distinctive content in Melzer's, but a few yellowish globules scattered in the
mount, after 30 minutes, however, some large violet-fuscous globules up
to 50 p in diameter forming in the mounts, their origin not clear. Clamp
connections absent.
Notes. This is a most unusual species of bolete. It has pseudocystidia and a unique pileus cuticle. Mounts of the pileus in KOH present a most cluttered appearance caused by the masses of amorphous
material, the viscose material surrounding the end-cells, and the refractive particles scattered through the cuticular layer (and some granular
material in the cells themselves). A lot of the material is apparently
soluble in chloral hydrate. See B. fistulosus for a discussion of their
similarities. It does not belong in Suillus, but may belong in Section
Pseudoleccinum of Boletus.
Boletus modestus Peck, Rept. N. Y. State Mus. 25:81. 1873
"Pileus firm, convex, often irregular, dry, minutely tomentulose,
yellowish brown; tubes nearly plane, attached and subdecurrent, pale
ochraceous, angular and compound; stem equal, brown, reticulated with
darker lines; spores elliptical,.0004' long,.0002' broad; flesh gray to
pinkish gray.
"Plants 2' [inches] high, pileus 2" [lines] broad, stem 2"-4"
thick. On grassy ground in open woods, Greenbush, August."
Type study. Spores 11-14 X 3.54.5 p, smooth, lacking an apical
pore, shape in face view suboblong to subfusiform, in profile obscurely
inequilateral, color in KOH dingy cinnamon-buff, in Melzer's pale reddish tan; wall about 0.2 pL thick.
Basidia 4-spored. Pleurocystidia large and conspicuous, 3544 X
10-15 p, clavate to clavate-mucronate, filled with dull rusty brown to
orange-brown content in KOH and the context as revived in Melzer's
much redder (dextrinoid), walls thin, hyaline, smooth.
Pileus cutis a layer of interwoven hyphae 4-8 p wide, the end-cells
tubular to weakly cystidioid, remainder of cells in a filament merely
tubular, walls thin and smooth, content brownish ochraceous in KOH
but fading on standing, in Melzer's dingy orange brownish and walls