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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75. Hebeloma wells-kemptonae sp. nov.
Pileus 7-13 cm latus, convexus demum late convexus vel planus,
subviscidus brunneoincarnatus. Contextus albus, sapor mitis. Lamellae
angustae, confertae, pallide brunneae. Stipes 6-9 cm longus, 15-30
mm crassus, deorsum subbulbosus, albidus, siccus, squamulosus. Velum albidum floccosum, evanescens. Sporae 12-17 x 7-9 rLm, crassotunicatae, dextrinoideae, inequilaterales. Basidia tetraspora. Pleurocystidia nulla. Cheilocystidia versiformia: cylindrica, fusoid-ventricosa,
elongat-clavata, capitato-pedicellata, etc.
Specimen typicum in Herb. Univ. Mich. conservatum est, WellsKempton 5304; legit ad viam prope Fairbanks, Alaska, 17 Aug 1971.
Pileus 7-13 cm broad, convex with an inrolled margin, becoming
broadly convex to plane, the margin often upraised; color brownish pink
becoming browner in age and on drying, tacky (subviscid) when fresh or
wet from rains, smooth, appearing slightly appressed-fibrillose. Context
white, odor not distinctive, taste pleasant and mild.
Lamellae narrow (4-6 mm), close, adnexed, white becoming pale
tan, finally dull brown, edges beaded with hyaline drops when young.
Stipe 6-9 cm long, 15-30 mm thick, equal more or less to a
bulbous base, white, dry, scurfy to scaly with scattered floccose fibrillose scales overall (mostly toward the apex), apex often beaded with
drops, scales white at first, becoming brown. Context white, stuffed to
solid.
Partial veil white, floccose, leaving a floccose band on pileus
margin, veil soon evanescent and at times the remnants found near the
base of the stipe, pileus margin sulcate from gill impressions in the soft
velar tissue.
Spore deposit about "Verona Brown" to "Sayal Brown." Spores
12-17 x 7-9 RLm, wall about 0.5 [Jm thick, surface finally punctateroughened but long remaining smooth (under high-dry objective),
apex having a hyaline spot; color bright clay color to darker in KOH,
in Melzer's dark reddish brown (dextrinoid); shape in face view decidedly ovate, in profile inequilateral, apex often snoutlike.
Hymenium.-Basidia large (9-13 VLm broad near apex), clavate to
cylindric. Pleurocystidia absent. Cheilocystidia clavate to pedicellatecapitate, some more or less utriform, very variable in size: widest cells +
20 JIm broad (+ balloon-shaped above a pedicel 5-8 (12) ILm diam);
clavate-pedicellate cells (28) 33-50 x 9-13 rnm; rarely some cells fusoidventricose, hyaline at first but all types becoming bunched indiscriminantly and agglutinating, becoming rusty brown both in the wall and
context in the process.
Lamellar and pilear tissues.-Lamellar trama typical of the genus