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

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hyphoid to cellular, the layer dark brown in KOH, in Melzer's a redder brown and pigmented deposits evident but no dextrinoid debris.
Tramal hyphae typical for the genus, but at first with a red flush in
Melzer's but this soon fading.
Habit, habitat, and distribution.-Gregarious under spruce,
Dexter, Michigan, October 12, 1977 (type, MICH).
Observations.-This variant occurred by the hundreds in the
spruce plantation between October 10 and 15. The heavy bicolored
veil and mild taste were observed on hundreds of fruiting bodies.
98. Hebeloma gregarium Peck (e)
Ann. Rep. N.Y. State Mus. 49: 18. 1896
Pileus 2.5-3.5 cm broad, hemispheric to convex to obtuse or with
a small inconspicuous umbo, surface slightly viscid when moist, becoming radiately rimose by old age, glabrous except for the slight coating
of velar fibrils over the marginal area; color pale ochraceous or with
the disc more or less reddish tawny. Context whitish, odor of crushed
tissue raphanoid.
Lamellae thin, close, adnate, whitish at first, then dull cinnamon,
broad.
Stipe 3-5 cm long, 2-4 mm thick, slender, stuffed becoming
hollow, whitish fibrillose, slightly pruinose above, with a faint pallid
annular zone of fibrils from the broken veil, base not discoloring
appreciably.
Spores (8.5) 9-11 x 4.5-7 rLm, in face view elliptic to ovate, in
profile slightly inequilateral, ornamentation very faint, wall thin and
spores in KOH merely pale yellow, not dextrinoid.
Hymenium.-Basidia 4-spored. Pleurocystidia none. Cheilocystidia 28-54 x 5-9 x 4-6 Rim, subcylindric to fusoid-ventricose, apex
obtuse to somewhat capitate, hyaline.
Lamellar and pilear tissues.-Lamellar trama of narrow (3-5 Pxm
diam), subparallel hyphae pallid in KOH, cells ~ elongate. Cuticle of
pileus an ixocutis, the hyphae 2-4 xlm diam, hyaline, clamps present.
Hypoderm "cellular" (Hesler).
Habit, habitat, and distribution.-Gregarious on sandy soil in
heathy places, Delmar, New York, late fall. Peck's type.
Observations.-This species is closely related to H. kauffmanii,
H. subrimosum, and H. pascuense. It differs from H. kauffmanii in the
tendency for the pileus to become rimose, in having a raphanoid odor,
and a bitter to disagreeable taste. This last observation was made by
G. E. Morris, November 2, 1908 on a collection identified by Peck.
From H. pascuense it differs in its rimose pileus, broad gills, and in