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

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THE BOLETES OF MICHIGAN

Michigan or any other area. For this reason we have not given synonymy nor are we discussing variation in the complex. A comprehensive
treatment will be included in a monograph on Leccinum now in preparation by Smith, Thiers, and Watling.
103. Leccinum singeri Smith & Thiers, sp. nov.
Pileus 3-8 cm latus, demum late convexus, glaber, viscidus,
brunneogriseus vel subspadiceus. Contextus pallidus tactu incarnatoargillaceus. Tubuli pallidi; pori avellanei tactu lutei, tarde lignobrunnei.
Stipes 6-12 cm longus, 10-15 mm crassus; contextus tactu sordide cinnabarinus; deorsum atrosquamulosus, sursum brunneo-punctatus. Sporae
15-20 X 5-6.5 i. Caulocystidia 30-35 X 10-20 u demum 100-200 X
6-10 (10-20),, proliferata. Specimen typicum in Herb. Univ. Mich.
conservatum est; prope Mackinaw City, Emmet County, July 23, 1965,
legit Smith 71844.
Pileus 3-8 cm broad, convex becoming broadly convex; surface glabrous, viscid, pale grayish brown to bister, margin even and not appendiculate. Context soft and soon collapsing, pallid when cut but soon
staining dingy pinkish tan at least near the cutis, with FeS04 quickly
bluish; taste acid, odor mild.
Tubes pallid becoming wood-brown or (when bruised) darker and
near "warm sepia," depressed, seceding and free in age, ventricose, 2 cm
deep in widest place; pores small, round, avellaneous, staining yellowish
and finally dark wood-brown.
Stipe 6-12 cm long, 10-15 mm thick at apex, solid, when cut
cinnamon reddish to cinnabar, in the base dark red, at times yellow
below and in old specimens olivaceous near apex; surface pallid to
brownish; ornamentation weakly brownish at first but finally blackish,
typically fine above and coarser below, blackish at maturity, that over
the upper part usually remaining brownish.
Spores dark yellow-brown ("snuff-brown") in deposit; spores 15-20
X 5-6.6 u, smooth, ochraceous to clay color singly in KOH,
yellow-fulvous in groups, in Melzer's about the color of the mounting
medium (yellowish) and the content finely granular; apex with a small
hyaline spot.
Basidia 4-spored, 18-25 X 10-15,u, hyaline in KOH, with a large
hyaline globule in many. Pleurocystidia-none found. Cheilocystidia resembling basidioles but varying to subfusoid, ochraceous in KOH. Caulocystidia mostly ventricose-mucronate and 30-35 X 10-20 u, tapered to a
mucro abruptly but in age the mucro often developing into a hyphal-like