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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5-6 rim, surface minutely punctate or marbled, pale dull clay color in
KOH, in Melzer's pale reddish tan (not truly dextrinoid), in face view
boat-shaped to ovate, in profile inequilateral to narrowly inequilateral.
Hymenium.-Basidia 4-spored, 7-8 xm broad near apex, projecting when sporulating. Pleurocystidia none. Cheilocystidia abundant,
pedicellate-clavate, the apex 6-12 Ixm broad (cells 28-57 x 4-5 x 6 -12 xm), hyaline, thin-walled, not agglutinated.
Lamellar and pilear tissues.-Lamellar trama typical for the genus. Cuticle of pileus an ixolattice, the hyphae about 1.5 xm diam,
hyaline, refractive in KOH, branched and with clamp connections.
Hypodermium hyphoid, the area pale tawny in KOH, about the same
in Melzer's, dextrinoid debris present in the layer. Tramal hyphae of
pileus typical for the genus.
Habit, habitat, and distribution.-Along an open road, among grass
and weeds bordering a mixed spruce-deciduous stand, Anchorage,
Alaska, August 10, 1971, Wells and Kempton 5143 (type, MICH).
Observations.-The collectors made no mention of a veil, but the
remains of a rudimentary marginal veil were ascertained from the
dried specimens. This species should be compared with H. mesophaeum and variants which resemble it in field characters to a considerable extent. The spores and cheilocystidia, however, readily distinguish it. The cheilocystidia readily distinguish it from H. pascuense.
59. Hebeloma griseocanum sp. nov.
Pileus 1.5-2 cm latus, obtuse campanulatus, fibrillosus, siccus,
violaceo-brunneus demum griseobrunneus. Contextus pallide brunneus, odor et gustus subraphanicus, Lamellae latae, confertae, adnatae, griseobrunneae. Stipes 2-3 cm longus, 3-3.5 mm crassus, pallidus,
deorsum argillaceus. Velum copiosum, pallide griseum subannulatum.
Sporae 9-12.5 x 7-9 (10) ~Jm, dextrinoideae, in "KOH" argillaceae,
subleves. Cheilocystidia 47-90 x 5-11 x 3-5 [Jm, ad basin ventricosa,
rare cylindrica. Cuticula pileorum ixocutis est.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
90121; legit prope Lost Man Camp, Independence Pass, Pitkin
County, Colorado, 31 Aug 1979.
Pileus 1.5-2 cm broad, obtusely campanulate, dry to the touch
because of a covering of veil fibrils, colors "Wood Brown" to "Benzo
Brown" ( dark violet-umber to dark grayish brown), margin at first
fringed with remnants of the veil which is gray. Context dull brown,
odor and taste pungent (raphanoid?).
Lamellae broad, close, adnate, dull grayish brown, edges white
floccose when young, neither beaded nor spotted.