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

TYLOPIL US

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Observations.-We are not prepared at this time to assert that B.
fumosipes is synonymous with Frost's species. The inflated cheilocystidia of the latter gelatinized, as is often true for the pore dissepiments in boletes, but must be regarded as an important feature of the
species. Although amyloid material was not found in the Frost collection studied, under the present circumstances it cannot properly be assumed that the species will never show it.
Material examined.-Emmet: Smith 63888. Gratiot: Potter 13389.
Livingston: Hoseney 538. Montcalm: Potter 13210. Oakland: Smith
7118, 64311; Thiers 4690. Luce: Smith 39291. Washtenaw: Smith
18639, 18846, 62638, 64625, 72610; Thiers 4519.
44. Tylopilus fumosipes (Peck), comb. nov.
Boletus fumosipes Peck, Rept. N. Y. State Mus. 50:108. 1897.
Boletus nebulosus Peck, Rept. N. Y. State Mus. 51:292. 1898.
Illus. Figs. 40-43, 45-46.
Pileus 2-5 cm broad, convex to nearly plane, minutely tomentose,
sometimes minutely rivulose, dark olive-brown; flesh whitish; tubes at
first nearly plane, becoming convex with age, their pores whitish when
young, becoming yellowish brown, changing to bluish black where
bruised; stipe 2-5 cm long, 6-8 mm thick, equal, solid, smoky brown,
minutely scurfy under a lens. Spore deposit purplish brown.
Type study: Two basidiocarps studied and both represented the
same species.
Spores 12-14 (18) X 4-5 (6) Iu, smooth, apex lacking a pore but a
very minute thin spot evident in some spores; shape in face view subovate to obtusely fusiform, in profile more or less inequilateral, the
suprahilar depression broad and varying from shallow to deep; color in
KOH dingy ochraceous becoming paler, in Melzer's pale dingy tan with a
darker border (possibly indicating a slight amyloid reaction), no amyloid
content seen in any spores; wall 0.3-0.4 I thick, thicker in KOH than in
Melzer's.
Basidia 4-spored, 24-35 X 8-12,, hyaline in KOH, yellowish in
Melzer's. Pleurocystidia scattered, 33-42 X 9-13 u, subfusoid, content
dull brown and homogeneous in Melzer's; more refractive and granular
in KOH (not typical chrysocystidia). Cheilocystidia smaller than pleurocystidia; tube edge gelatinizing readily in KOH. Caulocystidia 30-60 X
10-18 I, mostly clavate but some globose and some elongate-subfusoid,
thin-walled, hyaline in KOH, not incrusted.