The veiled species of Hebeloma in the western United States / Alexander H. Smith, Vera Stucky Evenson, and Duane H. Mitchel.

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the cap margin to the stipe, but the fibrillose coating of the stipe may
indicate the presence of one in very young buttons. The combination
of the types of cheilocystidia and pattern of delayed elongation along
with the well-developed ixocutis of the pileus indicate that the specimens belong in Hebeloma.
100. Hebeloma littenii sp. nov. (g)
Pileus 2-6.5 cm latus, plano-convexus, ad marginem undulatus,
hygrophanus, glaber, brunneus, demum sordide aurantio-cinnamomeus; odor et gustus mitis. Lamellae subdecurrentes vel adnatae,
confertae, latae, pallide argillaceae demum sordide cinnamomeae.
Stipes 3-6 cm longus, 5-13 mm crassus, leviter fibrillosus, deorsum
brunnescens. Velum pallidum, sparsum. Sporae 10-12 x 6-7.5,im,
non dextrinoideae, in cumulis "Sepia," ellipsoideae vel ovoideae.
Cheilocystidia 32-63 x 5-11 x 4-5,um, fusoid-ventricosa vel ovata,
9-12 [Lm lata.
Specimen typicum in Herb. Univ. Mich. conservatum est, legit in
Mt. Desert Isl., Hancock County, Maine, 29 Oct 1980; W. Litten.
Pileus 2-6.5 cm broad, plano-convex, becoming plane; margin
thin and at times becoming wavy, surface hygrophanous, glabrous,
when moist light brown (ISCC-NBS) to light reddish brown (before
fading to moderate orange), rarely subrimose (in age irregularly), as
dried the pileus evenly + "Verona Brown." Context thick on the disc,
very thin at margin, translucent yellowish brown when fresh, fading to
almost white and then opaque; odor and taste not distinctive.
Lamellae decurrent by a tooth when young, later adnate, close,
moderately broad; edges eroded; surface light tan when young, becoming darker (brown) in a "patchy pattern" (Litten).
Stipe 3-6 cm long, 5-13 mm thick (mostly about 1 cm thick),
stuffed; surface somewhat fibrillose; color pallid at apex, darker brown
near base; veil fibrillose, pallid, all traces soon vanishing.
Spore deposit as air dried + "Sepia." Spores 10-12 x 6-7.5 VIm,
thin-walled, minutely punctate under an oil-immersion objective,
nearly hyaline in KOH, not dextrinoid; in face view elliptic, in profile
elliptic to oblong.
Hymenium.-Basidia 4-spored, as revived in KOH with numerous hyaline globules, 7-9 [m broad when sporulating. When first revived in Melzer's dull red but soon fading. Pleurocystidia none. Cheilocystidia abundant, 32-63 x 5-11 x 4-5 Rim, fusoid-ventricose, some
ovoid and 9-12,xm diam; becoming considerably elongated in age and
apex in some subcapitate; content often dull ochraceous but homogeneous in KOH as revived.