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

The Subgenus Hebeloma

133

griseus, odor pungens, sapor mitis. Lamellae latae, confertae, brunneomaculatae. Stipes 4-7 cm longus, 1-3 cm crassus, abrupte bulbosus,
squamulosus, deorsum tarde brunnescens. Sporae 12-15 x 6.5-8 pJm,
late inequilaterales, dextrinoideae, verruculosae. Basidia tetraspora,
9-12 JIm, clavata. Cheilocystidia 52-70 x 7-9 pIm, elongate clavata.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
89184; legit prope Elk Camp, Burnt Mt., Pitkin County, Colorado, 29
Aug 1978.
Pileus 5-9 cm broad, broadly convex, becoming plane or nearly
so, viscid, opaque, "Pecan Brown" to "Rood's Brown," on the margin
"Pale Vinaceous-Pink," margin at first decorated with thin evanescent
patches of fibrils from a very scanty veil. Context watery gray fading to
whitish, odor pungent, taste mild; FeSO4 slowly staining stipe base
grayish; KOH on context no change.
Lamellae broad, close, adnexed, seceding, edges uneven, "Verona Brown," not beaded but edges spotted a darker brown than the
faces (from dried droplets?).
Stipe 4-7 cm long, 1-3 cm thick at apex, equal or nearly so,
flared slightly at the base to an abrupt bulb, + solid but with pith area
+ fibrous; becoming brownish within generally; surface with concentric zones of pallid scales, a basal zone present and this easily mistaken
for a slight veil, in age glabrescent.
Spore deposit "Warm Sepia" to "Verona Brown" as air-dried
(distinctly reddish brown). Spores 12-15 x 6.5-8 pm, warty-rugulose
(under a high-dry objective), shape in profile broadly inequilateral,
ovate in face view, dextrinoid.
Hymenium.-Basidia 4-spored, 9-12 [Jm broad near apex, containing refractive globules in many of the cells. Pleurocystidia none.
Cheilocystidia 52-70 x 7-9 RJm, elongate-clavate, very abundant, hyaline, not agglutinated.
Lamellar and pilear tissues.-Lamellar trama typical for the genus. Cuticle of pileus and ixotrichodermium collapsing in age to an
ixolattice, the hyphae 2-4 Jim diam and the walls refractive, many with
adhering hyaline particles of debris (in KOH mounts). Hypodermium
hyphoid, yellowish in KOH fresh, reddish brown in KOH as revived,
walls mostly minutely roughened. Tramal hyphae intricately interwoven, the cells greatly inflated, thin-walled, smooth and hyaline.
Clamps present.
Habit, habitat, and distribution.-Clustered on a stream bank, in
woods of spruce and fir with some pine, near Snowmass Village, at Elk
Camp, Pitkin County, Colorado, August 29, 1978 (type, MICH).
Observations.-This is one of the species confused with H. sinapizans in North America, and though possessing a "veil," is not