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

under oil-immersion lens, inequilateral in profile varying to subfusoid,
in face view ovate, slightly dextrinoid.
Hymenium.-Basidia typical for the genus, 4-spored. Pleurocystidia absent. Cheilocystidia 48-70 x 5-8 x 3-4 (5) Vm, elongatefusoid ventricose, neck flexuous, apex blunt.
Lamellar and pilear tissues.-Lamellar trama parallel, hyaline in
KOH, yellowish in Melzer's. Cuticle of pileus an ixolattice of hyphae
2-3 VJm diam, often branched, clamp connections present. Hypodermium cellular, scarcely distinctive in KOH (slightly ochraceous). Pilear
trama very pale ochraceous in KOH, interwoven, most hyphae enlarged to 10-12 [Lm diam, not reddish tinted in Melzer's.
Habit, habitat, and distribution.-Scattered under spruce and fir,
west of Hesse town site, Boulder County, Colorado, August 20, 1979,
Vera Evenson (type, DBG).
Observations.-This species is close to H. fragrans (which see),
but its stipe is greenish at the base in FeSO4, the context stained slightly
ochraceous, the hypodermium is merely yellowish as revived in KOH,
the veil is white, and the spore ornamentation is readily visible under an
oil-immersion objective.
43. Hebeloma subsacchariolens sp. provisiorum
Pileus + 4.5 cm broad, broadly convex, surface dry and under a
lens thinly matted-fibrillose, or near the margin streaked with aggregations of fibrils, the edge decorated with patches of pale buff veil fibrils;
disc + pale dull brown, margin at first grayish brown. Context thin,
white; odor fragrant, taste bitter but soon fading. KOH on cuticle no
reaction: FeSO4 staining the base of the stipe green instantly.
Lamellae broad, subdistant, adnate, becoming ventricose, pale
dull tan; edges eroded but neither beaded nor spotted.
Stipe + 6 cm long and ~ 1 cm thick, soon hollow; surface dark
tan below, paler near apex, at first with a thin coating of pale buff
fibrils from the veil but no annular zone or zones evident.
Spores 10-14 x 6.5-8.5 (10) (Lm, smooth, clay color in KOH;
shape in profile view inequilateral and many with a snout, in face view
broadly elliptic to subelliptic or subglobose; pale reddish in Melzer's
(weakly dextrinoid); often with a large central globule (as mounted in
KOH).
Hymenium.-Basidia 4-spored, 32-40 x 9-14 (mm clavate, containing globules, in mass reddish orange in Melzer's. Pleurocystidia
none. Cheilocystidia variable: basically with a ventricose area midway
toward base or near the base, neck usually finally greatly elongated
and either tubular or the walls flexuous; apex obtuse to subcapitate;
yellowish to pale clay color or merely hyaline as revived in KOH;