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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distance back from the apex (as revived), + refractive in KOH and
hyaline.
Lamellar and pilear tissues.-Lamellar trama typical for the genus. Cuticle of pileus a thin ixocutis, hyphae 2-3.5 (im diam, the layer
often obscured by overlying veil hyphae. Hypodermium hyphoid, in
KOH with heavy reddish brown pigmented deposits on the wall; color
in Melzer's a brighter reddish brown. Tramal hyphae typical for the
genus. Veil hyphae tubular, 3-6 pLm diam, clamp connections present,
hyaline in KOH.
Habit, habitat, and distribution.-Scattered to gregarious on
swampy ground (muck) under spruce, Elk Camp, Pitkin County, Colorado, August 25, 1978 (type, MICH).
Observations.-The pallid veil, strongly inequilateral mediumsized spores, canescent pileus, and raphanoid odor and taste indicate a
relationship to H. idahoense from which it differs mainly in the characters of the cheilocystidia.
70. Hebeloma pseudofastibile sp. nov.
var. pseudofastibile
Pileus 3.5-4 cm latus, convexus demum late expansus, glaber
vel ad marginem albofibrillosus, argillaceus, subviscidus, demum
subrimosus. Contextus brunneolus, odor et gustus raphanicus. Lamellae latae, confertae, sordide cinnamomeae. Stipes 6-9 cm longus,
8-9 mm crassus, fragilis, dissiliens, ad basin fulvescens. Vellum
pallidum demum subochraceum. Sporae 9-12 (13) x 6-7 pm, inequilaterales, leviter dextrinoideae, subleves. Basidia tetraspora. Cheilocystidia 40-80 x 4-9 x 3-5 JIm, hyalina; vel filamentosa, 3.5-5
pcm diam ad apicem obtusa.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
90425; legit prope Snowmass Village, Pitkin County, Colorado, 30 Jul
1980.
Pileus 3.5-4 cm broad, broadly convex, glabrous but at first with
white patches of fibrils along the margin, pinkish tan to clay color over
the disc, margin paler, scarcely viscid, cuticle tending to become rimose. Context brownish, thin but firm, odor and taste raphanoid,
FeSO4 staining base of stipe blackish.
Lamellae broad, close, adnate, thin, more or less "Sayal Brown"
at maturity (dull cocoa-brown), beaded with hyaline drops at first,
edges serrulate.
Stipe 6-9 cm long, 8-9 mm thick at apex, equal, fragile, splitting
lengthwise fairly readily, becoming dull rusty brown in the base and
then upward; surface pallid-fibrillose and over this layer occurs rem