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

rial; shape in profile inequilateral, in face view ovate; slowly slightly
dextrinoid.
Hymenium.-Basidia 4-spored. Pleurocystidia none. Cheilocystidia elongate clavate, 6-8 tim wide at apex.
Lamellar and pilear tissues.-Lamellar trama typical for the genus. Cuticle of pileus an ixolattice and easily removed in sectioning,
the hyphae about 2 pJm wide and some with ends like the cheilocystidia
(elongate-clavate) and 6-8 [xm wide near apex; clamps present at most
septa. Hypodermium cellular in tangential sections (intermixed in radial sections), ochraceous in fresh material mounted in KOH. Pileal
trama typical for the genus.
Habit, habitat, and distribution.-On very rotten conifer wood,
Independence Pass area, Pitkin County, Colorado, July 23, 1976,
Mitchel and Smith (type, MICH).
Observations.-The failure of the base of the stipe to discolor on
standing, the presence of cuticular cystidia resembling the cheilocystidia, and the watery spots on the pileus are a unique set of characters
when combined with the presence of a veil. Watery spots are common
among the species in subgenus Denudata.
58. Hebeloma kemptonae sp. nov.
Pileus 1.5-3 cm latus, convexus, demum plano-umbonatus, viscidus, glaber, + "Pinkish Cinnamon," ad marginem pallidior; odor mitis. Lamellae luteo-pallidae demum pallide brunneae, latae, confertae,
adnatae. Stipes 3-4 cm longus, 4-5 mm crassus, dissiliens, albidus,
pruinose punctatus. Velum sparsum, albidum. Sporae 9-12 x 5-6 pJm,
punctatae leviter dextrinoideae, in "KOH" argillaceae. Basidia tetraspora. Cheilocystidia 28-57 x 4-5 x 6-12 ILm, pedicellato-clavata,
non agglutinata.
Specimen typicum in Herb. Univ. Mich. conservatum est, Wells
and Kempton 5143; legit prope Anchorage, Alaska, 10 Aug 1971.
Pileus 1.5-3 cm broad, convex, with margin connivent, expanding to nearly flat or retaining a low umbo; color pale orange-tan ( +
pinkish cinnamon) on disc, paler on the margin, tacky to viscid when
fresh, margin becoming slightly sulcate in some, glabrous. Context
white, thin, odorless.
Lamellae moderately broad (+ 5 mm), close, adnate, pale ivory
becoming light brown, not beaded, edges concolorous with the faces.
Stipe 3-4 cm long, 4-5 mm broad, tending to split longitudinally,
equal, whitish, white pruinose-punctate, at first thinly floccose from a
rudimentary white veil, hollow.
Spore deposit about "Sayal Brown" as air-dried. Spores 9-12 x