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

The Subgenus Hebeloma

89

KEY TO STIRPES
1. Spores 7-12 [pm long............................... Stirps Praeolidum (p. 89)
1. Spores 10-15 pLm long................................ Stirps Fragrans (p. 90)
Stirps PRAEOLIDUM
Spores 7-12 Jim long.
KEY TO SPECIES
1. Growing under ash and soft maple on swampy ground............................................. see H. naucorioides (i) (p. 171)
1. G rowing under or near conifers........................................... 2
2. Veil grayish; taste mild.................. see 10. H. brunneodiscum (p. 39)
2. Veil pallid to buff............................................ 3
3. Lamellae narrow; cheilocystidia 27-41 x 5-11 rxm, cylindric to fusoid
ventricose..................................... see 50. H. pinetorum (p. 102)
3. Lamellae broad at maturity.............................................. 4
4. Taste very disagreeable; odor heavy and sickening-sweetish in time..................................................... 40. H. p raeolidum
4. Taste mild but odor strong and peculiar; spores + 8-10 ptm long................................ see 21. H. brunneomaculatum (p. 52)
40. Hebeloma praeolidum sp. nov.
Illus. P1. 4.
Pileus (1.5) 2-4 (6) cm latus, obtuse conicus demum late convexus vel umbonatus, viscidus, ad marginem fibrillosus, glabrescens;
ad centrum pallide argillaceus vel luteobrunneus, ad marginem pallide
griseobrunneus; odor graveolens; sapor valde subamarus (distinctissimus). Lamellae confertae, latae, luteobrunneae. Stipes 4-7 cm longus,
(4) 5-7 mm crassus, deorsum brunneus, sursum pallide argillaceus.
Sporae 9-12 x 5-6.5 pJm, in "KOH" subleves, argillaceae. Basidia
tetraspora. Cheilocystidia 36-50 x 5-8 Jm, filamentosa vel ad basin +
ventricosa.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
17169; legit prope Olympic Hot Springs, Olympic National Park,
Washington, 22 Sep 1941.
Pileus (1.5) 2-4 (6) cm broad, obtusely conic with an inrolled
margin, broadly convex to expanded umbonate at maturity, surface
viscid and glabrous except for scattered fibrillose patches from the
remains of the thin pallid buff cortina along the margin, on the disc
"Cinnamon-Buff" or browner, the marginal area paler and grayer.
Context thick in the disc (3-4 mm), tapered evenly to the margin,