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

Stipe 2-3 cm long, 3-3.5 mm thick, equal, pallid, pallid as dried
except for the base which becomes slightly clay color, fibrillose to the
fibrillose annular zone, silky above the zone. Veil copious, pale grayish
and pallid as dried.
Spores 9-12.5 x 7-9 (10) jLm, appearing smooth under high-dry
objective, in profile view broadly inequilateral, broadly ovate in face
view, dextrinoid, some with + of an apical snout, in KOH pale clay
color.
Hymenium.-Basidia 4-spored, in Melzer's when first mounted
reddish but becoming orange-ochraceous on standing. Pleurocystidia
none. Cheilocystidia abundant, 47-90 x 5-11 x 3-5 pm, pedicellateventricose and with greatly elongated neck, hyaline, thin-walled, not
agglutinated; less often short and merely fusoid-ventricose, rarely
cylindric.
Lamellar and pilear tissues.-Lamellar trama typical of the genus,
mostly yellow revived in Melzer's. Cuticle of pileus a poorly defined
ixocutis 3-6 hyphae deep and with only slightly gelatinizing walls, the
hyphae 3-4 Ipm diam, hyaline in KOH and some with fine hyaline
adhesions. Veil hyphae usually covering the cuticle. Hypodermium
dark reddish brown in KOH, hyphoid, the hyphae 5-12 JIm diam and
with conspicuous incrustations on the walls. Clamps present.
Habit, habitat, and distribution.-Two growing together on the
needle carpet under spruce, Lost Man Camp, Independence Pass, Pitkin County, Colorado, August 31, 1979 (type, MICH).
Observations.-The very broad, smooth, strongly dextrinoid
spores and the grayish fibrillose pileus make a distinguishing set of
characters.
60. Hebeloma pseudofastibile var. distans var. nov.
Illus. PI. 11; figs. 7-8.
Pileus 2-4 cm latus, convexus demum late convexus, canescens,
glaber, subviscidus, sordide aurantio-cinnamomeus; odor et gustus raphanicus. Lamellae subdistantes vel distantes, perlatae, ventricosae,
pallide brunneolae demum subcinnamomeae. Stipes circa 4 cm longus,
8-12 mm crassus, fragilis, sursum pallidus, deorsum sordide alutaceus.
Velum + ochraceum, fibrillosum. Sporae 9-12.5 x 5.5-6.5 JIm, +
leves in "KOH" ellipsoideae vel ovoideae vel phaseoliformes. Basidia
tetraspora. Cheilocystidia 40-60 x 6-11 x 5-7 pIm, cylindracea vel
deorsum ventricosa, ad apicem subcapitata.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
68874; legit prope McCall, Idaho, 3 Aug 1964.