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

TYLOPIL US

93

brown-Smith); spores 11-17 X 4-5.5 p, smooth, lacking an apical pore,
shape in face view nearly oblong to narrowly ovate, in profile obscurely
inequilateral, color nearly hyaline in KOH and yellowish to tawny occasionally in Melzer's, with a poorly defined gelatinous sheath.
Basidia 28-36 X 9-12 u, hyaline in KOH, yellowish in Melzer's,
4-spored. Pleurocystidia 35-46 X 8-12 J, scattered, fusoid-ventricose,
hyaline in KOH and yellow in Melzer's, the content not distinctive,
smooth, thin-walled, apex subacute. Cheilocystidia similar to pleurocystidia or more obventricose and obtuse.
Trama subparallel and subgelatinous in mature specimens. Cuticle
of pileus a tangled turf of narrow hyphae 4-7, wide (about the same
size as those of the context), yellow in KOH from dissolved pigment,
almost all evidence of a trichodermium lost by the matting down of the
elements. Context of hyaline floccose hyphae. Caulocystidia scattered
or in fascicles, yellow in KOH, content not distinctive in Melzer's. Clamp
connections not demonstrated for certain.
Habit, habitat, and distribution.-Solitary to scattered, usually under
aspens in our region, fruiting most abundantly early in the summer, late
June and early July near Pellston.
Observations.-This species is both beautiful and distinct in its
pink pileus and yellow base of the stipe. It can be accurately identified
in the field. McIlvaine stated that it was edible and delicious, but it is
difficult to find specimens that are not riddled with insect larvae. During
wet periods in early summer, however, it can be found in quantity. In
Ammirati 3750, the mature pileus dried yellow.
The differences cited in the color of the spore deposit are no
doubt partly due to the moisture content of the spore deposit when the
color was noted, and in part to different strains of the fungus. The
variations noted are nearly all clearly within the spore-color spectrum of
the genus.
Material examined.-Cheboygan: Charlton G-207; Chmielewski 9;
Kilburn 3607; Smith 36713, 36854, 37330, 37377, 37857, 58144,
62954, 63009, 64852; Thiers 2859, 2909, 3377, 3460, 3720, 3779,
3826. Emmet: Brask 3605. Gratiot: Potter 10040, 10143. Houghton:
Kauffman 1906. Oakland: Smith 18749. Ogemaw: Smith 67422.
Ontonagon: Ammirati 3750. Roscommon: Potter 10156. Luce: Smith
38275, 38525, 42603, 50236. Washtenaw: Smith 6700, 18549, 18699;
Wehmeyer 7-17-59.