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 Veiled Species of Hebeloma

originating from a hypodermium of inflated cells having rusty brown
walls.
Habit, habitat, and distribution.-Gregarious under mixed conifers, Independence Pass, Pitkin County, Colorado, July 19, 1976,
Smith 86872 (type, MICH).
Observations.-The cuticle of the pileus may possibly originate as
an ixotrichodermium, but if so the elements soon become appressed to
the surface of the pileus and as revived in KOH give the impression of
an ixocutis. The grayish veil, distinctly fragrant odor, mild taste, lamellae which become pale grayish pink before the spores mature, along
with the weak reaction of the base of the stipe to FeSO4 form the
distinctive combination of characters.
H. versipelle (Fr.) sensu Romagnesi (1965; p. 322) is very close to
our H. brunneodiscum, but the base of the stipe in the latter becomes
blackish brown, its taste is mild, and its veil is gray. We cannot be sure
that the odor of H. versipelle as described by Romagnesi (l.c.,
"d'herbe de persil") is the same as that present in H. brunneodiscum,
and so are assuming that they are different-at least until more collections can be studied.
Stirps REPANDUM
Spores dextrinoid.
11. Hebeloma repandum Bruchet
Bull. Soc. Linn. de Lyon, 39 annee: 50. Jun 1970
Illus. Bruchet, l.c., pl. xii.
Pileus 2-3 cm broad, obtuse with a spreading margin and incurved edge, becoming + expanded-umbonate, viscid, dingy clay
color over disc, marginal area grayer (near avellaneous but tinged
with yellow) and usually with a slight zone of appressed veil fibrils
that is inconspicuous. Context firm, pallid when faded, odor slight,
taste distinctly bitter-pungent (almost acrid); with FeSO4 instantly
olive-fuscous on lower part of stipe, the color change slower elsewhere; KOH gives no significant reaction, dextrinoid in Melzer's
reagent.
Lamellae narrow, close, adnate, edges uneven, surfaces pallid
becoming a dull dingy brown, not beaded.
Stipe 3-4.5 cm long, 3-4 mm thick at apex, hollow, firm, evenly
enlarged downward or equal, dingy brown below, whitish near apex,