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

TYLOPIL US

119

The following data were obtained from a study of the type of B.
indecisus: Spores 10-13.5 X 4-4.5 Iu, smooth, lacking a pore or thin spot
at apex, shape in face view narrowly elliptic to subfusiform, in profile
somewhat inequilateral, varying to very obscurely inequilateral, in KOH
yellowish to nearly hyaline and many with dark violaceous particles in
the interior (often in the aggregate resembling chromosomes in anaphase), in Melzer's weakly dextrinoid and lacking violet or dark inclusions; wall thin (-0.2 u).
Basidia 4-spored, 7-9 p, broad, reviving very poorly. Pleurocystidia
scattered, 30-52 X 10-18 Iu, clavate-mucronate or the neck 4-6 u wide
and elongated to 15-30 JI, apex obtuse, content reddish tawny and
amorphous in KOH (reminding one of that of chrysocystidia). Cheilocystidia gelatinizing like the hymenium.
Tube trama of tubular nonamyloid hyphae and laticiferous elements 5-11 I wide, which are bright yellow in Melzer's; no amyloid
walls or content observed in any hyphae. Pileus cuticle a tangled mass of
narrow (3-6 p) flexuous tubular long-celled hyphae yellowish in KOH,
walls thin and lacking incrustations, the subcuticular hyphae reddish
tawny in Melzer's from color in the cell wall. Clamp connections absent.
Observations.-We have no explanation for the dark granules observed in the spores when mounted in KOH.
Material examined.-Cheboygan: Smith 39216. Gratiot: Potter
10896, 11789. Livingston: Hoseney 390; Warren 8-1956. Marquette:
Bartelli 2530. Washtenaw: Kauffman 1907, 1914, 1923; Smith 62598,
64857.
53. Tylopilus subpunctipes (Peck) Smith & Thiers, comb. nov.
Boletus subpunctipes Peck, Bull. N. Y. State Mus. 119:19. 1907.
Illus. P1. 61.
"Pileus fleshy, broadly convex, often uneven on the surface, becoming soft with age, brown, reddish brown when dry, flesh white slowly becoming dingy where cut or broken, taste mild; tubes nearly plane
in the mass, adnate or but slightly depressed around the stem, the
mouths small, round, whitish or grayish white, changing to reddish
brown where wounded; stem equal or nearly so, solid, slightly reticulate
at the top, very minutely dotted, sometimes obscurely squamulose at
the top, grayish or pallid; spores rusty brown or cinnamon-brown, oblong or subfusiform,.0004-.0005 of an inch long,.0002-.00024 broad.
"Pileus 2-4 inches broad; stem 2-3 inches long, 4-6 lines thick.
Shaded sandy soil. Menands, Albany Co. August.