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

The Subgenus Hebeloma

91

2. Taste mild; veil pallid................................42. H. boulderense
3. Taste mild (not distinctive)....................... 41. H. fragrans var. fragrans
3. Taste bitter at first........................................ 4
4. Spores 6.5-8.5 (10) pxm broad..................... 43. H. subsacchariolens
4. Spores 6-7 pIm broad................................. 44. H. perplexum
41. Hebeloma fragrans sp. nov. var. fragrans
Pileus 1.5-3 cm latus, obtusus demum convexus vel planus,
glaber, vel ad marginem leviter fibrillosus, subviscidus, ad centrum
fuscobrunneus, tarde pallidior. Context fragilis, fragrans, sapor mitis.
Lamellae subdistantes, latae demum ventricosae, cinnamomeoargillaceae. Stipes 2-3.5 cm longus, 3-4.5 mm crassus, fragilis, cinereobrunneus, brunnescens; velum cinereo-argillaceum. Sporae 10-15
x 6-7 pLm, non dextrinoideae; inequilaterales, Cheilocystidia 42-73
x 4-6 rLm, ~ cylindrica vel filamentosa, vel 38-67 x 6-12 x 4-6
rim, fusoide ventricosa, hyalina.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
90594; legit prope Elk Camp, Burnt Mt., Pitkin County, Colorado, 28
Aug 1980, Evenson, Mitchel, and Smith.
Pileus 1.5-3 cm broad, obtuse to convex, becoming plane, surface soon glabrous or margin retaining faint patches of grayish buff veil
remnants, subviscid, disc fuscous-brown, margin dull tawny to paler,
opaque at all times, when faded pale reddish tan except for fuscousbrown disc. Context thin and fragile, odor fragrant, taste slight; FeSO4
blackish in base of stipe.
Lamellae subdistant, depressed-adnate, broad and in age ventricose, + "Sayal Brown" at maturity.
Stipe 2-3.5 cm long, 3-4.5 mm thick, equal, fragile, pale grayish
brown overall and fibrillose from grayish buff veil, darkening from the
base upward, no veil zones evident.
Spores 10-15 x 6-7 Jm, appearing smooth in KOH and punctate in Melzer's; not dextrinoid when fresh or as dried, inequilateral in
profile view, ovate in face view.
Hymenium.-Basidia 4-spored, 8-10.5 (Jm broad near apex.
Pleurocystidia none. Cheilocystidia 42-73 x 4-6 (Jm and cylindric to
filamentous, and some 38-67 x 6-12 x 4-6 tJm, fusoid-ventricose and
apex not enlarged, hyaline in KOH, scattered along the edge as well as
in groups.
Lamellar and pilear tissues.-Lamellar trama typical of the genus.
Cuticle of pileus a thin ixocutis of hyphae 1.5-3 (4) Ilm diam,
branched sparingly, clamps present. Hypoderm hyphoid to cellular,
walls not highly colored in KOH or in Melzer's. Pileal trama typical of
the genus (no red tints developing in Melzer's medium).