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

the margin at first decorated with fibrils or patches from the broken
veil, color of the disc + reddish tawny to alutaceous, toward margin
paler to pallid buff. Context white, odor and taste raphanoid or taste
finally bitterish.
Lamellae sinuate, adnexed or emarginate, pallid at first, slowly
becoming cinnamon, edges white fimbriate, broad at maturity, close to
subdistant, at times beaded with hyaline drops of liquid.
Stipe 4-6 cm long, 5-10 mm thick, white, firm, fibrillose, equal
above the bulbous base, solid or slightly hollow finally, not brunnescent in age; veil cortinate, thin, leaving remnants on upper portion of
stipe but seldom forming more than a slight annular zone.
Spores (9) 10-12 x 5.5-6.5 pJm, somewhat inequilateral in
profile, elliptic in face view, varying to ~ boat-shaped (some obscurely snoutlike at apex), ochraceous in KOH, slowly slightly argillaceous in Melzer's (not dextrinoid), surface + smooth under highdry objective.
Hymenium.-Basidia 4-spored. Pleurocystidia none. Cheilocystidia 36-76 x 5-12 x 4-6 pxm, fusoid-ventricose, filamentous-subcapitate or narrowly clavate, becoming agglutinated in age.
Lamellar and pilear tissues.-Lamellar trama typical for the genus. Cuticle of pileus an ixocutis. Hypodermium hyphoid. Clamps
present.
Habit, habitat, and distribution.-On humus in conifer forests,
Idaho and Wyoming (?), summer and fall.
Observations.-We have not collected var. fastibile in the western
area. Kauffman collected it in Boundary County, Idaho, and Simon
Davis found it in Wyoming, but we are inclined to question the identity of the Wyoming collection. However, since H. fastibile is the type
species of the genus we have included it here. The characters emphasized by Moser (1978) are: the stipe is not scaly (but Fries described it
as "squamuloso alba"), it is 10-15 mm thick, the pileus is reddish
brown on the disc and paler toward the margin, the lamellae are cocoa
colored (reddish cinnamon), the odor and taste are radishlike, and the
spores are 9-11 x 6-7 pm.
At present we lack an adequate North American collection which
has been carefully described in detail and for which we know the
FeSO4 reactions (especially on the base of the stipe), the iodine reaction of the spores and of the tramal tissues, the degree of roughness of
the spores, the color of the spore print, degree to which the stipe
darkens in age (or does not darken), and the color of the veil in
unexpanded basidiocarps. The shape of the spores in profile view allows the species to be arranged in either section. Horak's (1968) drawings indicate the spores are distinctly roughened.