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

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THE BOLETES OF MICHIGAN

Habit, habitat, and distribution.-Scattered along an old logging
road in mixed woods of birch, aspen, balsam, and spruce, Sugar Island,
Chippewa County, July.
Observations.-This is a slimy-viscid, pallid bolete with very fine
inconspicuous stipe ornamentation. It is readily distinguished from L.
holopus by the slimy pileus and pores which stain avellaneous.
88. Leccinum holopus (Rostkovius) Watling
Trans. Brit. Mycol. Soc. 43:692. 1960
var. holopus
Illus. P1. 79.
Pileus 3-10 cm broad, pulvinate to convex, becoming broadly
convex or nearly flat, margin often exceeding the tubes by 0.5 mm;
surface soft and tacky to the touch (subviscid), in age or when wet
slightly more viscid, typically glabrous and unpolished but some slightly
areolate at times over the disc, rarely with inconspicuous streaks from
appressed fibrils, dull white and remaining this color or if water-soaked
olivaceous along a broad marginal area, disc often tinged buff to vinaceous-buff, rarely pea-green overall in age. Context thick, white, soft
when sectioned not staining or finally brownish (especially around larval
tunnels), odor and taste not distinctive.
Tubes 1-2.5 cm deep, adnate but soon deeply depressed around
the stipe, pallid to pale olive-buff, in age wood-brown; pores whitish
becoming brownish as spores mature, when bruised staining yellow and
then brown.
Stipe 8-14 cm long, 1-2 cm thick, equal or nearly so, not staining
pink in apex when flesh is cut; surface pallid, ornamented with squamules which become brownish (rarely blackish), apex merely scurfy and
remaining pallid a long time, greenish to bluish in the base of the stipe
when mature.
Spore deposit about cinnamon-brown; spores 14-20 X 5-6.5 u,
smooth, no apical pore evident, shape in face view subfusoid, in profile
narrowly inequilateral, color pale dingy cinnamon to ochraceous-cinnamon revived in KOH, yellowish in Melzer's when immature and dark
reddish brown when mature, wall slightly thickened.
Basidia 4-spored, 26-32 X 8-11 p, clavate with hyaline to pale
cinnamon content in KOH, yellowish in Melzer's. Pleurocystidia
scattered to rare, fusoid-ventricose, 28-36 X 9-12 u, almost imbedded in
hymenium, content not distinctive either in KOH or Melzer's, no