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

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THE BOLETES OF MICHIGAN

Habit, habitat, and distribution.-Gregarious under pine, usually P.
resinosa, September, not uncommon during wet seasons.
Observations.-This is the taxon that was described as the type
variety in error by Smith & Thiers (1964). The white (type) variety, var.
luteolus, and S. subalutaceus are so similar in the dried state that one
cannot make an accurate identification of them without detailed notes
on the basidiocarps when fresh. The distribution and the tree associates
of the taxa in this group need further critical study.
16. Suillus intermedius (Smith & Thiers), stat. nov.
Suillus acidus var. intermedius Smith & Thiers, Contrib. toward a Monograph
of N. Amer. Sp. of Suillus p. 74. 1964.
Illus. PI. 19.
Pileus 5-10 (17) cm broad, convex to obtuse becoming plane or
obscurely umbonate; glabrous, glutinous, pallid yellow when young,
darkening to yellow-ocher and finally yellow-brown (near "clay color")
to dingy pale cinnamon and then often streaked or spotted with drying
gluten, margin often appendiculate with soft yellow patches of veil tissue. Context thick, yellowish white to pale ochraceous, unchanging
when cut; odor none or slight, taste of slime acid to mild, of context
mild.
Tubes 4-6 mm deep in large pileus, adnate to short-decurrent, pale
yellow; pores small (about 2 per mm), pale yellow ("cartridge-buff")
and beaded with hyaline drops when young, darker yellow in age, often
spotted in age, unchanging when bruised or becoming slowly brownish.
Stipe 4-10 cm long, 5-12 mm thick, equal or nearly so, solid,
cortex salmon-ochraceous in lower part; surface pallid yellowish with
darker dingy glandular spots which are dingy brown and slowly change
to fuscous by old age, surface darkening where handled and one's fingers
soon stained black from handling it; annulate near the apex with a
gelatinous soft, pale buff band of veil tissue (a floccose layer interior to
a gelatinous one).
Spore deposit dull cinnamon ("Sayal-brown"); spores 8-11 X
3.5-5 u, pallid dingy ochraceous in KOH and only slightly more tan in
Melzer's, wall very slightly thickened; in face view obscurely fusiform, in
profile inequilateral and with apex often slightly turned up.
Basidia clavate, 16-20 X 4-6 L, 4-spored, hyaline to pale ochraceous in KOH. Pleurocystidia in bundles with the incrusting material
around the base of the bundle dark bister in KOH, 38-55 X 8-12 J,
clavate to subfusoid, content hyaline or dark yellow-brown, walls thin,