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

Observations.-A collection by Kauffman (August 27, 1923,
Medicine Bow Mts., Wyoming) apparently belongs here. In the type
collection the cheilocystidia have a tendency to be slightly enlarged at
the apex, a feature we now consider important in the genus. European
authors have pointed out that H. mesophaeum and H. strophosum
intergrade.
30. Hebeloma bicoloratum var. coloradense var. nov.
Illus. PI. 10; figs. 23-24.
Pileus 2-4 cm latus convexus demum plano-expansus, viscidus,
pallidofibrillosus, glabrescens, griseus vel brunneogriseus ("Drab"
vel "Wood Brown") tarde demum brunneo-cinnamomeus, ad marginem + appendiculatus. Contextus pallidus, odor et gustus subpungens (non raphaninus). Lamellae latae, confertae, adnatae, pallidae
demum obscure cinnamomeae, non maculatae. Stipes 4-6 cm longus, 6-10 crassus, pallidus, fibrillosus, deorsum brunnescens. Sporae
8.5-11 x 5.5-6.5 (7) Jim, ovoideae vel ellipsoideae vel in laterales
subphasaeoliformes, non dextrinoideae. Cheilocystidia 34-75 x 4-7
VLm, subclavata, filamentosa vel cylindrica vel fusoide-ventricosa.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
89594; legit prope Elk Camp, Pitkin County, Colorado, 29 Jul 1979.
Pileus 2-4 cm broad, convex becoming plane or nearly so, +
viscid at first, coated with pallid veil fibrils, dark grayish brown (+
"Drab" to "Wood Brown,") glabrescent and slowly fading to dull
cinnamon ("Sayal Brown") or dingy tawny, patches of the veil persistent along the margin. Context pallid when faded, watery gray when
moist, odor and taste ~ pungent (not truly raphanoid); FeSO4 quickly
staining base of stipe olive to olive-fuscous.
Lamellae broad, close but distinct, adnate-seceding, pallid at first
then becoming dull brown and finally cinnamon, thin, edges even and
neither beaded nor stained dark brown.
Stipe 4-6 cm long, 6-10 mm thick, equal, pallid, with copious
veil remnants and these showing an outer pinkish buff layer and a
pallid inner one; surface soon becoming bister from the base upward.
Spores 8.5-11 x 5.5-6.5 (7) im, ovate to elliptic in face view,
elliptic to + bean-shaped in profile, smooth as viewed in KOH, in
Melzer's minutely marbled; clay color in KOH, thin-walled, not dextrinoid.
Hymenium.-Basidia 4-spored, 7-8 JIm wide near apex, clavate.
Pleurocystidia none. Cheilocystidia 34-75 x 4-7 FIm, abundant,