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

Lamellar and pilear tissues.-Lamellar trama typical for the genus. Subhymenium not distinctively colored in Melzer's. Cuticle of
pileus an ixocutis, the hyphae 2-3 [Lm diam, interwoven, appressed.
Hypodermium hyphoid and not distinctly colored in KOH or Melzer's,
the layer merely more compact than the trama beneath it. Clamp
connections present.
Habit, habitat, and distribution.-On leaf mold under aspen near
the edge of a swamp; collected by B. B. Kanouse, Medicine Bow Mts.,
Wyoming (above Centennial), August 28, 1923 (type, MICH).
Observations.-The large spores, white to pale or dark creamcolored pileus, lack of a distinctive odor or taste, and the narrow close
gills are the distinctive characters. This species should be added to the
list of aspen-associated agarics for the Rocky Mountain area.
It is to be assumed from Kauffman's notes that a veil was present
in the young fruiting bodies, but he did not state this as a fact. H.
salmonense differs in having a thinly fibrillose stipe and a distinctly
raphanoid odor and taste. Dr. B. B. Kanouse, who discovered this
species, was for many years curator in the University of Michigan
Herbarium.
38. Hebeloma salmonense sp. nov.
Illus. Figs. 39-40.
Pileus 3-6 cm latus, obtusus demum convexus vel planoumbonatus, ad marginam fibrillosus, demum glaber, viscidus, pallide
luteoalbus; odor et gustus raphanoinus. Lamellae albidae demum fulvae, confertae, angustae demum latae. Stipes 6-9 cm longus, 6-10
mm crassus, albus, tarde deorsum argillaceus, sparse fibrillosus.
Sporae 9-13 x 6.5-8 imm, + dextrinoideae, limoniformes. Basidia
tetraspora. Cheilocystidia 36-58 x 7-10 x 6-7 x 7-9 (Jm, fusoide
ventricosa, elongato-clavate vel cylindrico-subcapitata.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
70148; legit prope Burgdorf, Idaho, 4 Sep 1964.
Pileus 3-6 cm broad, obtuse expanding to convex or plane to
plano-umbonate, margin incurved at first and slightly fibrillose from a
thin veil, soon glabrous, viscid, pale pinkish buff overall and only
slightly darker as dried (whitish at first); odor and taste raphanoid.
Lamellae narrow becoming broad, close, adnate to adnexed,
edges even, not beaded or spotted.
Stipe 6-9 cm long, 6-10 mm thick, equal, soon hollow, white,
gradually becoming clay color from the base upward, thinly fibrillose