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

DESCRIPTION OF
SUBGENUS HEBELOMA
HEBELOMA (Pers.: Fr.) Kummer
Der Fuihrer in die Pilzkunde, p. 80. 1871
Pileus subviscid to viscid or slimy; surface glabrous or with veil
remnants variously distributed but usually with at least a zone of fibrils
along the margin; color white to ochraceous, grayish, brown or dark
reddish brown; odor and/or taste of radish in many species; hypodermium absent to well developed (cellular).
Lamellae broad to narrow (rarely), and adnate to sinuate or
rarely decurrent, whitish to brownish or pinkish avellaneous at first,
clay color to deep reddish brown at maturity (mostly "Verona Brown"
at maturity); edges often beaded with hyaline droplets at first, crenulate to dentate or even.
Stipe (1.5) 2.5-15 (30) mm thick, equal to bulbous, of various
lengths depending on the species, solid to hollow; rarely annulate, the
veil + fibrillose and leaving a superior and often evanescent zone
where it breaks, remains below this line almost absent to copious and
variously dispersed, the fibrils white to gray to ochraceous buff or clay
color, rarely with a pinkish tinge.
Spore deposit ochraceous to clay color to various shades of reddish brown or cinnamon brown, rarely purplish brown.
Spores smooth (rarely) to ornamented in some degree, wall
about 0.2-0.6 (Jm thick and typically colored; shape in profile inequilateral to elliptic, ovate to ~ bean-shaped, or apex + snoutlike.
Hymenium.-Basidia typically 4-spored, clavate, rarely with distinctive inclusions such as hyaline globules. Pleurocystidia mostly absent. Cheilocystidia of various types (all on a single gill section in some
species), rarely if ever truly thick-walled, in shape clavate, fusoidventricose, elongate-clavate, elongate-capitate, or merely filamentous.
Caulocystidia when present usually about like the cheilocystidia or
longer.
Lamellar and pilear tissues.-Pileal trama hyaline to yellow as
revived in Melzer's or in some species bright red to orange but if red
then often soon fading. Cuticle of pileus a simple ixocutis to an ixolattice in most species, more rarely an ixotrichodermium; the cuticular

23