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

SUILL US

57

smooth or at times with pigment incrustations. Cheilocystidia similar to
pleurocystidia but more numerous and more of them colored. Caulocystidia numerous and the entire caulohymenium becoming dark bister
from amorphous material in age.
Tube trama somewhat divergent from an indistinct narrow parallel
strand of floccose hyphae, subhymenial zone gelatinous, floccose hyphae
colored to hyaline in KOH. Pileus cuticle a collapsed trichodermium of
pale dingy ochraceous hyphae (in KOH) which have scarcely any granular content, little incrusting debris, and are gelatinous and 3-6.6 M wide,
their outline very distinct as revived in KOH. Clamp connections none.
Habit, habitat, and distribution.-Scattered to gregarious under
pine, mostly P. resinosa, common in August and September after wet
weather along the south shore of Lake Superior.
Observations. -During the summer of 1965 this species was collected repeatedly near Culhane Lake in Luce County. Its relationships
are with S. subolivaceus, a western species, from which it differs in the
color of the pileus and stipe. Both have the matted mycelium at the
base, and both have the tubes copiously beaded with drops when young
and fresh.
Material examined.-Cheboygan: Smith 72817. Chippewa: Smith
72860, 72871. Luce: Smith 58078. Mackinac: Smith 43783.
17. Suillus subalutaceus (Smith & Thiers), stat. nov.
Suillus acidus var. subalutace-us Smith & Thiers, Contrib. toward a Monograph of
N. Amer. Sp. of Suillus p. 75. 1964.
Illus. P1. 20.
Pileus 3-6 cm broad, obtuse to convex or in age with an obtuse
umbo, surface thinly slimy-viscid, somewhat variegated, color when
young "pinkish buff' to more yellowish but soon changing toward
vinaceous-buff ("vinaceous-buff") especially on the variegations, often
merely "light pinkish cinnamon," margin often appendiculate with remains of the veil. Context thick, pallid near the cutis, nearly lemonyellow above the tubes, odor and taste mild; where bruised slowly becoming vinaceous brownish.
Tubes 4-6 mm deep (shorter than the depth of the pileus), decurrent, pale yellow and staining vinaceous-cinnamon where bruised or in
contact with KOH; pores round, small, pale brownish, about 2 per mm.
Stipe 8-10 cm long, 10-15 mm thick, equal, pallid to yellowish,
near apex the interior yellowish, solid; surface with numerous vinaceous-cinnamon glandular dots both above and below the annulus;
annulus a broad band of floccose material the outer layer gelatinous.