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

12. Hebeloma luteobrunneum sp. nov.
Pileus + 3 cm latus, convexus vel subplanus, leviter viscidus,
pallide spadiceus, ad marginem fibrillosus. Velum ochraceum, evanescens. Odor et gustus submitis. Lamellae connfertae, angustae, +
cinnamomeae. Stipes 3-5 cm longus, 2-4 mm crassus, aequalis, luteobrunneus, zonatus. Sporae 9-11.5 x 5-6 pxm, ellipsoideae vel ovoideae, non dextrinoideae. Pleurocystidia nulla. Cheilocystidia 32-69 x
5-9 pm, fusoid-ventricosa, obtusa. Cuticula pileorum ixotrichoderma
est. Hypodermium cellularum.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
88819; legit prope Independence Pass, Pitkin County, Colorado, 31 Jul
1978.
Pileus + 3 cm broad, convex to nearly plane, slightly viscid, ~
"Snuff Brown" (a dingy yellow-brown or dull date color), marginal
area at first dotted with the buff remains of the veil. Odor and taste
not distinctive.
Lamellae narrow, close, adnate, dingy pinkish tan (~ cinnamon),
not beaded and not spotted.
Stipe 3-5 cm long, 2-4 mm thick, equal, yellow-brown to the
apex, zoned with ochraceous-buff remnants of the veil and an annular
zone ~ persistent.
Spores 9-11.5 x 5-6 [m, ellipsoid to ovoid, minutely roughened, not dextrinoid (merely yellowish in Melzer's).
Hymenium.-Basidia 4-spored, 24-28 x 5-7 pLm, projecting
when sporulating. Pleurocystidia none. Cheilocystidia numerous, 32 -69 x 5-9 pJm, fusoid-ventricose, necks elongating, apex obtuse, not
agglutinating.
Lamellar and pilear tissues.-Lamellar trama typical for the genus. Cuticle of pileus an ixotrichodermium, the elements narrow and
clamped at the septa. Hypodermium cellular, rusty brown in KOH.
Pilear trama of hyaline hyphae, the cells ~ vesiculose.
Habit, habitat, and distribution.-Scattered under conifers, Independence Pass area, Pitkin County, Colorado, July 31, 1978, Smith
88819 (type, MICH).
Observations.-The diagnostic characters are: the dingy yellowbrown pileus, pale ochre-yellow veil, the narrow gills and the ixotrichodermium of the pileus. The short, inflated cells of the pileal
trama are a possible additional character, but we hesitate to emphasize
it at present.
13. Hebeloma subannulatum sp. nov.
Pileus 1-2.5 cm latus, obtusus deinde plano-umbonatus, ad marginem albofibrillosus, subviscidus, alutaceus; odor pungens, gustus mi