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

188

THE BOLETES OF MICHIGAN

91. Leccinum olivaceo-glutinosum Smith, Thiers, & Watling
Mich. Bot. 6:140. 1967
Illus. P1. 82.
Pileus 5-10 cm broad, obtuse to convex, the margin flaring and in
age sometimes uplifted but lacking a sterile extension; surface glabrous
and viscid to slimy, dull olive to olive-brown young, becoming olivegreen over marginal area, disc developing a cinnamon undertone in age.
Context pallid, firm, slowly changing to brownish (near avellaneous)
when cut, instantly blue with FeSO4, odor and taste mild.
Tubes 1-2 cm deep, depressed, pallid becoming wood-brown when
mature, cinnamon-stained in age; pores pallid staining dingy yellowish
brown when injured.
Stipe 9-15 cm long, 9-15 mm thick at apex, evenly enlarged downward to equal, pallid tinged vinaceous and occasionally olive at apex,
lower part cottony-reticulate to striate, with brown or finally blackish
dots or squamules at apex, rarely with reddish stains at the base, solid,
pallid but staining yellow in base at times when cut, slowly changing to
olivaceous near tube line and finally at times when cut flushed olivegreen in apex and below this slowly becoming brownish gray ("woodbrown").
Spore deposit rich yellow-brown (near "argus-brown"); spores
16-19 X 5-6.5 J, smooth, rich yellow-brown singly and more so in
groups as revived in KOH, duller brown in Melzer's, only a small number
dextrinoid, fusoid to subfusiform in face view, inequilateral-elongate and
with a distinct suprahilar depression in profile, wall slightly thickened
and apex with a thin spot but no distinct pore.
Basidia 4-spored, 26-33 X 10-13 j, clavate, with large hyaline
droplets, yellowish in Melzer's. Pleurocystidia not observed. Cheilocystidia 18-26 X 6-9 Mu, clavate to subfusoid and ochraceous in KOH.
Caulocystidia basically fusoid-ventricose, 40-75 X 9-18 u, in addition
usually developing a hyphal-like flexuous to corkscrew-like proliferation
up to 50,u or more long and 4-5,i wide, the cell content pale brown.
Caulobasidia scattered, hyaline or a few dark bister (at times including
the sterigmata) from a colored wall.
Pileus trichodermium of appressed thin-walled smooth readily disarticulating hyphae 4-9 (12) t wide, the cells tubular and with dingy
ochraceous content when revived in KOH (when fresh some were seen
to have green granules), content granular and pale ochraceous to
brownish revived in Melzer's, terminal cells mostly elongate-fusoid, not