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

108

The Veiled Species of Hebeloma

Lamellar and pilear tissues.-Lamellar trama typical for the genus. Cuticle of pileus a thick ixocutis (over 100 Rxm thick), the hyphae
much-branched, hyaline, refractive, 1.5-2 [tm wide and clamped. Hypodermium intermediate as to type and not highly colored in Melzer's,
no incrustations of significance noted. Tramal hyphae typical for the
genus. Clamps present.
Habit, habitat, and distribution.-On waste ground, conifers
nearby, Trinidad, California, December 24, 1965, White and Smith
(type, MICH).
Observations.-The important characters appear to be the
orange-brown pileus when young, mild odor and taste, thick stipe, the
thin pallid veil, dextrinoid spores distinctly rough under a high-dry
objective (43 x), and the thick pilear ixocutis.
Section HEBELOMA
Subsection MAGNISPORAE subsect. nov.
Sporae 10 (Lm vel ultra longae, in lateralibus amygdalaceae.
Typus: Hebeloma kuehneri
Spores 10 RIm or more long, inequilateral in profile.
KEY TO STIRPES
1. Stipe not staining or discoloring in the lower portion by late maturity................................................ Stirps Coniferarum (p. 108)
1. Stipe soon darkening at base or lower portion, then upward.................. 2
2. Spores dextrinoid (medium to dark reddish brown in Melzer's)................................................ Stirps Kuehneri (p. 115)
2. Spores not dextrinoid, but in a mount a few may be found which become
pale to ~ reddish brown in 30 minutes; (dried specimens are most
reliable for this test)........................... Stirps Oregonense (p. 138)
Stirps CONIFERARUM
Stipe not darkening appreciably from the base up.
KEY TO SPECIES
1. Cheilocystidia fusoid-ventricose, the apices subcapitate; odor pungent........................................................... 55. H. p ungens
1. N ot as above.......................................................... 2
2. Cheilocystidia (some of them) cylindric-subcapitate; pileus slimy viscid;
pilear cuticle an ixotrichodermium..................... 56. H. kelloggense
2. N ot as above........................................................ 3