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

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THE BOLETES OF MICHIGAN

subcutis orange-ochraceous to yellowish in Melzer's. Clamp connections
absent.
Observations.-Our account here is the original description supplemented with data obtained from the type. We designate the Frost specimen at Albany as lectotype. Smith noted that this material was not the
same as B. bicolor in general appearance as dried, and this point is
further emphasized by the wide angular pores, as is evident on the dried
specimen. The species does appear to be closely related to B. miniatoolivaceus, but again the size and shape of the pores distinguish it. Although the species is clearly in the stirps Fraternus of this work, it is
marginal in the sense that the pileus cuticle is of the type which becomes at least subviscid in age or when wet and does not become
areolate. We have not as yet recognized the species in the Michigan
flora.
139. Boletus campestris Smith & Thiers, sp. nov.
Illus. P1. 106 (lower).
Pileus 3-4 cm latus, siccus, velutinus, roseus, tarde luteus. Contextus luteus tactu caeruleus. Pori 1-2 per mm, lutei tactu caerulei.
Stipes 4-5 cm longus, 5-10 mm crassus, flavus, pruinosus. Sporae
11-14 (15) X 4.5-6 (7) L. Specimen typicum in Herb. Univ. Mich. conservatum est; Ann Arbor, July 16, 1966, legit Rup Chand (Smith
72961).
Pileus 34 cm broad, convex becoming broadly convex; surface dry
and velvety to unpolished, rose-red or deeper when young, paler pinkish
red when older, slightly rimose and a yellow flush showing in the cracks
in age, dull ferruginous as dried. Context thick, yellow (nearly flavous),
staining blue to greenish blue when bruised, odor and taste not distinctive.
Tubes 6-8 mm deep, sharply depressed at the stipe, flavous when
young, greenish yellow old, greenish blue when injured; pores 1-2 per
mm, round to angular, bright yellow young, greenish yellow in age,
bluish when injured.
Stipe 4-5 cm long, 5-10 mm thick, equal or nearly so, solid and
bright yellow within, staining greenish blue, surface flavous to pale
yellow at apex, pruinose and concolorous with pileus downward, base
coated with flavous mycelium.
Spores 11-14(15) X 4.5-6 (7) g, smooth, not truncate at apex,
soon dull yellow-ocher in KOH, in Melzer's with a tleeting-amyloid
reaction, soon pale dingy yellow-brown, elliptic to subfusoid in tace
view, in profile inequilateral with a sharply defined suprahilar depression, apex obtuse, wall about 0.5, thick.
Basidia 4-spored, 26-38 X 10-14 LI, clavate, yellow in KOH and
Melzer's. Pleurocystidia scattered, 34-56 X 9-13 j, ventricose with a