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

176

THE BOLETES OF MICHIGAN

Tubes about 10 mm deep, adnate becoming depressed around the
stipe, pallid to olive-buff, staining dingy vinaceous-brown when injured;
pores small, 2-3 per mm, olive-buff staining vinaceous-brown where
injured.
Stipe 11-14 cm long, 10-13 mm thick, equal, coarsely scabrous
but tips of scales mostly merely discolored dingy brownish (when dried
blackish brown), base dingy olive to pallid, remainder dingy pallid beneath the ornamentation, solid, pallid within and staining less than in
pileus context, olive in the base and with greenish areas in the cortex
but mostly remaining pallid.
Spore deposit near sepia (as taken naturally on a pileus); spores
11-15 X 4-5 g, smooth, narrowly fusiform in face view, somewhat inequilateral in profile, the suprahilar depression shallow, dingy ochraceous
to ochraceous-tan in KOH, dingy tan to ochraceous in Melzer's only a
few becoming dark reddish brown.
Basidia 4-spored, 20-25 X 7-9 u, clavate, yellowish to hyaline in
KOH and Melzer's. Pleurocystidia numerous as filamentous pseudocystidia projecting into the hymenium and with bister (dark brown) amorphous content as seen in both KOH and in Melzer's. Pileus trichodermium matted down to form an epicutis the hyphae of which are 4-7
(10)/ wide, the end-cells mostly tubular and obtuse at the tip. Clamp
connections absent.
Habit, habitat, and distribution.-On sandy soil, clustered in an
oak-aspen grove, Waterloo Recreation Area, Jackson County, September
10, 1961. Known only from the type locality.
Observations.-The tube mouths did not stain yellow as happens in
so many of the species of Leccinum, and the spores are narrower than
in L. subleucophaeum The distinguishing combination of features is the
whitish to olivaceous pileus, general tendency to stain vinaceous-brown,
the numerous pseudocystidia in the hymenium best demonstrated with
KOH or Melzer's, and the lack of inflated elements in the pileus cutis.
The slightly appendiculate margin of the pileus indicates a possible connection to section Leccinum, but in view of its being so poorly developed, the species is placed here.
83. Leccinum angustisporum Smith, Thiers, & Watling
Mich. Bot. 6:126. 1967
Pileus 3-5 cm broad, convex, dry and plush-like to merely unpolished, vinaceous-buff over the disc, whitish over margin, when young
dull whitish overall, margin irregular but not with a distinct sterile zone.