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

The Subgenus Hebeloma

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Spores 8.5-10.5 x 5-6 VLm, appearing smooth to faintly rugulose, ellipsoid, pale yellow in KOH, not dextrinoid, in profile view +
elliptic'
Hymenium.-Basidia 4-spored. Pleurocystidia none. Cheilocystidia 45-65 x 7-9 pm, some with an enlargement near the base, apex
obtuse to spathulate or rarely forked or branched.
Lamellar and pilear tissues.-Lamellar trama typical for the genus. Cuticle of pileus a poorly defined ixocutis, the hyphae ochraceous
in KOH and finely ornamented. Hypodermium hyphoid for the most
part, rusty brown in KOH and incrusted pigment on the hyphal walls,
hyphae up to 20 iLm diam. Clamp connections present.
Habit, habitat, and distribution.-Gregarious on needle carpet
under pine, near Independence Pass (Lost Man Camp), Pitkin County,
Colorado, July 31, 1978 (type, MICH).
Observations.-The spathulate to forked cheilocystidia are most
readily observed in mature to old pilei, and the same is true for the
rimose feature of the pileus. H. subrimosum has slightly larger spores
and a thicker stipe.
35h. Hebeloma mesophaeum var. duplicatum var. nov.
Pileus 1-3 cm latus, obtuse umbonatus, griseofibrillosus, glabrescens, triste cinnamomeus; sapor subpungens. Lamellae griseobrunneae
demum subcinnamomeae, confertae, latae. Stipes 3-5 cm longus, 3-5
mm crassus, deorsum brunnescens, sursum pallidus, leviter fibrillosus.
Velum griseum vel + pallidum, sublutescens. Sporae 7-9 (10) x 5-5.5
VJm, non dextrinoideae, ellipticae vel ovatae. Cheilocystidia 36-52 x
4-8 pLm, subcylindrica, leviter ventricosa vel anguste clavata. Cuticula
pileorum ixocutis est.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
90058A; legit prope Elk Wallow, Pitkin County, Colorado, 29 Aug
1979.
Pileus 1-3 cm broad, obtuse becoming broadly umbonate, coated
with a thin layer of grayish veil fibrils (heaviest along the margin),
ground color + dark cinnamon (+ "Sayal Brown") when moist, paler
when faded (about "Cinnamon-Buff"). Context with a slight pungent
odor and taste (subraphanoid); KOH on cuticle of pileus brownish;
FeSO4 on stipe base dark grayish brown.
Lamellae broad and ventricose, close, adnate to adnexed, avellaneous to wood brown, finally about "Sayal Brown" (dull cinnamon),
very slightly beaded.
Stipe 3-5 cm long, 3-5 mm thick, + equal, brownish within