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

The Subgenus Hebeloma

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on the pileus soon vanish and besides these are merely veil remnants
and all the related species also have veils of + similar texture.
35k. Hebeloma mesophaeum var. similissimum var. nov.
Pileus 2-4 cm latus, plano-unbonatus, viscidus, glaber, fulvus sed
ad marginem griseobrunneus et fibrillosus. Odor et gustus pungens
(subraphaninus). Lamellae confertae, adnatae, obscure cinnamomeae.
Stipes 3-4 cm longus, 3-4 mm crassus, brunneus. Velum subargillaceum. Sporae 8.5-10 (11) x 5.5-6.8 FLm, oblongae vel ovoideae, subleves. Cheilocystidia (35) 42-67 x 4-10 x 3-5 Fim, fusoid-ventricosa,
obtusa.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
87091; legit prope Independence Pass, Pitkin County, Colorado, 5 Aug
1976.
Pileus 2-4 cm broad, plano-umbonate, viscid, glabrous, tawny
over the disc, margin paler and grayish, often with thin clay color
patches of veil fibrils along the margin (as dried). Context white, odor
and taste pungent, FeSO4 on base of stipe merely brownish.
Lamellae close, adnate, narrow, pinkish brown when young, ~
"Verona Brown" in age (a dull reddish brown), not beaded.
Stipe 3-4 cm long, 3-4 mm thick, equal, solid, pallid within,
brownish at surface, with an annular fibrillose zone from the broken
veil, pallid and scurfy near the apex.
Spores 8.5-10 (11) x 5.5-6 (6.8) JIm, ellipsoid to ovoid, in profile some of them oblong, + smooth under a high-dry objective, not
dextrinoid, wall thin.
Hymenium.-Basidia 4-spored. Pleurocystidia none. Cheilocystidia (35) 42-67 x 4-10 x 3-5 Vxm, fusoid-ventricose, apex obtuse to
slightly enlarged, often with a wavy neck.
Lamellar and pilear tissues.-Cuticle of pileus an ixolattice fairly
well developed, the hyphae 2-7 pLm diam, branched, clamped at the
septa. Hypodermium cellular, reddish brown in KOH. Pileal trama of
radial hyphae 3-15 pJm diam, some hyphae with inflated cells, ochraceous in KOH.
Habit, habitat, and distribution.-Scattered under conifers, Independence Pass area, Pitkin County, Colorado, August 5, 1976 (type,
MICH).
Observations.-The narrow gills, color of the veil, and brownish
instead of olive-black FeSO4 reaction on the base of the stipe distinguish this variant from our concept of H. mesophaeum var. mesophaeum.