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

236

THE BOLETES OF MICHIGAN

A comparison of the Frost collection at Albany with Smith's material
clearly indicates that they are the same species. The most important
possible difference is in the ferruginous color of the pileus at first for
Michigan specimens; they faded, however, to the colors usually given for
the species. In order to present as complete an account of the species as
possible the original description is quoted below and Smith's study of
the microscopic features of the Frost specimen at Albany are added:
"Pileus flat, convex, yellowish brown, fasiculated red pilose, subtomentose young. Tubes at first whitish, then light yellow, not large,
falling away around the stem, or arcuate adnate. Stem light cinnamon or
weak gamboge color, striate at apex, thickened downwards, and subtuberous. Flesh yellowish white, just tinged."
Spores 8-11 (12) X 3.5-5 u, smooth, lacking an apical pore, ovate
to subfusoid in face view, in profile obscurely to somewhat inequilateral,
nearly hyaline in KOH, yellowish in Melzer's, wall thin (-0.2 p).
Basidia 4-spored, 8-11 l, broad, clavate, hyaline in KOH. Pleurocystidia fusoid-ventricose, 2842 X 7-12 g, thin-walled, smooth, hyaline
in KOH, content not distinctive in Melzer's (mostly appearing "empty"
but they were poorly revived). Cheilocystidia smaller than pleurocystidia. Caulocystidia clavate, 9-16 p broad, length variable, wall thin
and smooth, content hyaline ("empty").
Tube trama of weakly divergent hyphae inamyloid in all respects,
hyaline and smooth in KOH. Pileus cuticle a trichodermium of hyphae
6-15 p wide, the hyphae tubular or with cells inflated and some disarticulating, walls thin and smooth to minutely roughened, content
hyaline to yellowish in KOH and yellowish and homogeneous in
Melzer's, both short and long cells present in varying amounts, end-cells
bullet-shaped to cystidioid, or more rarely tubular to narrowly clavate.
Hyphae of subcutis yellowish in Melzer's. Clamp connections none.
121. Boletus mariae Smith & Thiers, sp. nov.
Pileus 4-9 cm latus, convexus demum late convexus, siccus, velutinus, olivaceus vel melleus. Contextus luteolus, immutabilis. Tubuli 1
cm longi olivaceolutei; pori olivaceolutei, immutabiles. Stipes 5-9 cm
longus, 8-15 mm crassus, intus luteolus, extus reticulatus, reticulum
latum, deorsum pruinosus. Sporae 9-12 (13) X 3.5-4.5 p. Specimen
typicum in Herb. Univ. Mich. conservatum est; prope Cheboygan, July
4, 1968, legit Mary Wells (Smith 75480).
Pileus 4-9 cm broad, convex with an incurved margin, becoming
broadly convex with the margin decurved, surface dry and velvety to