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

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THE BOLETES OF MICHIGAN

by the hymenium. Cheilocystidia similar to the second type of pleurocystidia but frequently having yellowish content in KOH. Caulocystidia
similar to the large incrusted pleurocystidia, occasionally in fascicles.
Tube trama gelatinous and divergent, nonamyloid. Pileus trichodermium of loosely tangled hyphae with short somewhat inflated cells
near apex (9-15 g in diameter), and with orange-buff content revived in
KOH. Context hyphae pale bister in KOH and with incrusting material
on the walls (in contrast to the hyphae of the trichodermium), the
hyphae thin-walled, nonamyloid in all parts. Clamp connections absent.
Habit, habitat, and distribution.-Scattered to gregarious under
white pine. It is regularly associated with this pine and fruits during the
summer and fall. It is common where white pine grows naturally, but
has, to date, not been found in plantations.
Observations.-The cystidial characters connect this species with
the viscid group. The species is so distinctive in the field on the basis of
the association with white pine and the red fibrils of the pileus that
there is little room for error in identifying it. It is also rated as a good
species for the table, and should be on the list of any hunter living or
vacationing in white pine country.
Material examined.-Cheboygan: Charleton G-197; Chmielewski 66;
Shaffer 1483; Smith 25982, 36858, 37880, 62937, 63960, 66941,
67227, 72403, 74708, 7-1-51, July 1951; Thiers 734, 3465, 3752, 4323.
Chippewa: Pennington 8-12-06; Smith 38590, 71928; Thiers 3853, 4339.
Crawford: Thiers 3390. Emmet: Kauffman 9-5-05; Smith 41902, 57397,
63767; Thiers 880, 3562, 3572. Gratiot: Potter 8429, 11191. Keweenaw: Povah FP 420, F1219; Mackinac: Smith 42903, 44113, 63909;
Thiers 3620. Marquette: Bartelli 208. Montcalm: Potter 10094.
Ogemaw: Cibula; Shaffer 2809; Smith 67506. Luce: N. J. Smith 140A;
A. H. Smith 36811, 37090, 36963, 38192, 39499, 41818, 44116; Thiers
3401.
7. Suillus proximus Smith & Thiers
Contrib. toward a Monograph of N. Amer. Sp. of Suillus p. 42. 1964
Illus. P1. 11.
Pileus 6-9 cm broad, obtuse, expanding to obtusely umbonate,
convex or broadly convex; surface slimy-viscid, glabrous; with pale pinkish cinnamon streaks beneath the gluten and an overall yellow ground
color, margin soon watery brownish where bruised. Context thick, yellowish to watery buff, in stipe apex with watery lemon-yellow streaks,
typically slowly staining green when cut; odor acid-metallic, taste mild;