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

The Subgenus Hebeloma

147

Pileus 4-5 cm broad, obtuse to convex, when expanded often
with a slight umbo, at first with faint patches or a fringe of veil fibrils
along the margin, soon entirely glabrous, viscid when moist, soon dry,
+ pale clay color over the disc and the margin pinkish buff to whitish.
Context firm, thick, watery pallid fading to white, odor and taste
strongly of radish, FeSO4 staining base of stipe blackish (olive-gray at
first).
Lamellae broad, adnate, close, dull "Sayal Brown," not beaded
and not spotted.
Stipe 4-7 cm long, 8-10 mm thick, equal, hollow, brunnescent
from the base up; surface long remaining whitish, thinly fibrillose from
pallid fibrils over lower portion.
Spores 10-13 (14) x 7-8.5 [xm, inequilateral in profile, ovate (to
~ snoutlike at apex) in face view, punctate finely in Melzer's reagent,
not dextrinoid, in KOH dull tawny.
Hymenium.-Basidia 4-spored, 8-9 RIm broad near apex, with
hyaline globules as revived in KOH, red at first in Melzer's reagent.
Pleurocystidia none. Cheilocystidia flexuous-filamentous becoming
elongate-clavate, 33-60 x 5-7 x 6-11 Jim, or not common but +
fusoid-ventricose with obtuse apex and 34-55 x 7-10 x 5-6 Jim,
hyaline in KOH.
Lamellar and pilear tissues.-Lamellar trama red in Melzer's in
places when first revived; consisting of broad, long and short hyphal
cells + parallel to (finally) interwoven. Cuticle of pileus an ixocutis of
hyphae 2-5 Jim diam, slime not copious, hyphae tubular and + weakly
ochraceous to hyaline in KOH. Hypoderm hyphoid and poorly differentiated, merely brownish in KOH and incrustations not significant.
Trama of pileus of + interwoven hyphae, red to orange-ochraceous in
Melzer's, large inflated cells variously distributed. Clamp connections
present.
Habit, habitat, and distribution.-Scattered under spruce and fir,
Elk Camp, Burnt Mt., Pitkin County, Colorado, August 28, 1980
(type, MICH).
Observations.-This species is distinct from H. pseudofastibile in
having most cheilocystidia distinctly enlarged at the apex at maturity
and in having broader spores with the apex tending more to snoutlike.
The veil fibrils were not observed to become ochraceous, and the stipe
was not noticeably fragile.
84. Hebeloma stanleyense sp. nov.
Pileus 1.5-3 cm latus, demum late convexus, ad marginem leviter
fibrillosus, triste rufobrunneus demum vinaceobrunneus ("Army
Brown"); odor et gustus valde raphanoideus. Lamellae albidae demum