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

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broad (see Peck's illustration), whitish becoming pale ochraceous to
more orange-cinnamon.
Stipe short, 3-5 cm long, 3-5 mm thick, firm, equal, solid, near
apex + pruinose ("mealy"), whitish or pallid, apparently not darkening.
Spores 8.5-10.5 x 6-6.5 JIm nearly hyaline in KOH and the
same in Melzer's (not dextrinoid); thin-walled, in face view ovate, in
profile + ovate to obscurely inequilateral apex rounded to obtuse,
surface practically smooth (under high-dry lens).
Hymenium.-Basidia 4-spored, clavate, 7-9 pxm wide near apex.
Pleurocystidia none. Cheilocystidia 40-65 x 6-10 x 3-4 x 3-5 [mm,
elongate fusoid-ventricose, apex weakly enlarged, neck flexuous, hyaline in KOH, not agglutinated.
Lamellar and pilear tissues.-Lamellar trama typical of the genus,
cells of hyphae only weakly inflated. Cuticle of pileus an ixocutis,
hyphae 2-5 mm wide, colorless. Hypodermium hyphoid, colorless in
KOH, pale orange-brown in Melzer's; amyloid debris present in the
mounts. Tramal hyphae of the pileus typical for the genus; clamps
present.
Habit, habitat, and distribution.-This species has not yet been
established as occurring in western North America, and has been confused with a number of species in the central and eastern states. It is
found growing gregariously in old fields featuring poor soil. Our description is based on a study of the type and Peck's original account in
order to avoid further confusion.
Observations.-The dried specimens remind one of those of H.
mesophaeum but it is clear from Peck's painting that the stipe does not
darken appreciably even at the base. At present we regard the amyloid
debris mentioned above as an artifact.
104. Hebeloma proximum sp. nov. (k)
Pileus 1.5-3 (5) cm latus, obtusus, demum plano-umbonatus, viscidus, pallide incarnato-cinnamomeus, ad centrum rufobrunneus; odor
et gustus valde raphaninus. Lamellae pallide incarnato-cinnamomeae
demum subfulvae, latae, confertae, adnatae. Stipes 6-10 cm longus,
4-9 mm crassus, solidus, dissiliens, pallide cinnamomeus. Velum fibrillosum, sparsum, pallidum. Sporae 8-10 x 5-5.5 Im, non dextrinoideae, ellipsoideae vel ovoideae, subleves. Basidia tetraspora. Cheilocystidia fusoid-ventricosa, 33-47 x 7-12 [Lm vel cylindrica et + 70 x
5-6 pJm, ad apicem obtusa.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
75218; legit sub Piceae, prope Hell, Michigan, 20 Oct 1967.

Pileus 1.5-3 (5) cm broad, obtuse, the margin at first inrolled,