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

Section MESOPHAEA
Subsection SUBVISCIDAE subsect. nov.
Sporae ellipsoideae vel ovoideae vel in lateralis ad apicem ~
obtusae vel rotundatae, 10-15 Vlm longus.
Typus: Hebeloma aggregatum
Spores ellipsoidal in profile with apex + broadly rounded (not
beaked or snoutlike in profile view), and 10-15 [xm or more long.
KEY TO SPECIES
1. Habitat on sand dunes, etc.; spores 11-15 x 7-8.5 jim; veil pale gray..................................................... H. affine (a) (p. 162)
1. Not as above.................................................. 2
2. Lamellae mottled at maturity, decurrent by a tooth when young;
spore deposit sepia................................ H. littenii (g) (p. 169)
2. N ot as above........................................................ 3
3. Pileus soon radially rimose, obtusely conic to campanulate when young........................................................ 1. H. subrim osum
3. N ot as above........................................................... 4
4. O dor and taste of radish.............................................. 5
4. Odor and taste not raphanoid......................................... 6
5. Lamellae pinkish gray; veil pallid........................ 2. H. vinaceogriseum
5. Lamellae clay color; veil buff............... H. subfastigiatum (q) (p. 180)
6. Odor fragrant; stipe coated with grayish fibrils... H. naucorioides (i) (p. 171)
6. Odor mild to farinaceous............................................. 7
7. Odor and taste farinaceous............................................... 8
7. O dor and taste not distinctive........................................... 9
8. Interior of stipe bay-red; hypodermium cellular..... H. sterlingii (o) (p. 178)
8. Interior of stipe not red; hypodermium hyphoid............. 3. H. utahense
9. Cuticle of pileus an ixotrichodermium to an ixolattice...................... 10
9. Cuticle of pileus an ixocutis............................................. 11
10. Stipe fragile, readily splitting lengthwise; growth habit caespitose...................................................... 4. H. aggregatum
10. Stipe not splitting lengthwise; gregarious................... 5. H. ollaliense
11. Spores dextrinoid.......................................... 6. H. subboreale
11. Spores not dextrinoid......................................... 7. H. wellsiae
1. Hebeloma subrimosum sp. nov.
Illus. Figs. 1-2.
Pileus 2-4 cm latus, obtusus demum convexus vel campanulatus,
glaber, subviscidus, hygrophanus, sordide fulvus vel ad marginem griseobrunneus, demum rimosus; odor nullus; sapor submitis. Lamellae