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

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longus, 2.5-4 mm crassus fragilis, avellaneus, deorsum demum vinaceobrunneus, dissiliens. Spores 8-10 (11) x 5-6 pxm, non dextrinoideae,
ellipsoideae vel subovoideae, subleves. Cheilocystidia fusoide ventricosa 32-48 (57) x 7-10 x 3.5-5 xm.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
88295; legit prope Chelsea, Michigan, 11 Oct 1977.
Pileus 2.5-4 cm broad, obtuse becoming plano-umbonate to
campanulate, margin usually decurved, surface slimy-viscid, decorated
with patches of the veil along the margin, disc glabrous; color +
"Cinnamon-Brown" over the disc and the margin "Sayal Brown,"
veil patches cinnamon-buff; surface opaque at all times. Context watery brown, thin, brittle, odor + pungent, taste slowly disagreeable;
FeSO4 staining base of stipe olive-fuscous; KOH on pileus cuticle no
reaction.
Lamellae crowded, narrow, adnexed, seceding, avellaneous to
wood brown to "Verona Brown," staining slightly to cocoa-brown,
edges even and not beaded.
Stipe 5-10 cm long, 2.5-4 mm thick, strict, brittle, equal, avellaneous above midportion at first, lower down coated with cinnamonbuff fibrils from the veil, soon becoming dark vinaceous-brown from
the base up, splitting longitudinally into segments readily when
broken.
Spores 8-10 (11) x 5-6 pIm, ~ pale snuff brown in KOH, paler
in Melzer's and minutely marbled, ovoid to ellipsoid, some in profile
view obscurely inequilateral, not dextrinoid.
Hymenium.-Basidia 4-spored, 7-9 jim wide near apex. Pleurocystidia none. Cheilocystidia mostly fusoid-ventricose, 32-48 (57) x 7 -10 x 3.5-5 [Lm, apex obtuse, hyaline, scattered.
Lamellar and pilear tissues.-Gill trama typical of the genus, the
orange-reddish tone becoming orange-ochraceous on standing (in
Melzer's mounts). Cuticle of pileus an ixocutis to an ixolattice, the
hyphae with gelatinizing walls and often collapsed, clamps present but
difficult to locate. Hypodermium + cellular in tangential section and
tawny-brown in KOH, redder brown in Melzer's, very little encrusting
material and no dextrinoid debris seen. Tramal hyphae typical for the
genus: + hyaline in KOH, reddish tan in Melzer's (color in the wall).
Habit, habitat, and distribution.-Under shrubs, near Chelsea,
Michigan, October 11, 1977 (type, MICH).
Observations.-The readily splitting and brittle stipe, staining of
the gills, slimy-viscid pileus and cinnamon-buff veil are distinctive. It is
close to H. brunneomaculatum, an Alaskan species, but the latter has a
peculiar odor and a mild taste along with a less fragile stipe, to say
nothing of the difference in habitat.