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

50

The Veiled Species of Hebeloma

Stirps NIGROMACULATUM
Pileus and/or gills staining dark brown to blackish finally.
KEY TO SPECIES
1. Stipe readily splitting lengthwise; lamellae narrow; veil in young
basidiocarps cinnamon-buff...................... H. angustifolium (c) (p. 164)
1. N ot as above........................................................... 2
2. Veil grayish (and pileus at first gray-canescent from remains of the veil)................................................ 19. H. griseocanescens
2. V eil w hite to buff or tan.............................................. 3
3. Veil whitish (pallid) (see H. substrophosum, p. 45)...... 20. H. nigromaculatum
3. Veil (or at least outer layer) buff to pale tan............................... 4
4. Odor unpleasant (crush the context); taste mild: FeSO4 staining
all parts green................................. 21. H. brunneomaculatum
4. N ot as above........................................................ 5
5. Hypodermium hyphoid; lamellae staining dark brown finally.. 22. H. angelesiense
5. Hypodermium cellular; lamellae not staining............. 23. H. sublamellatum
19. Hebeloma griseocanescens sp. nov.
Pileus 1-3.5 cm latus, obtusus demum convexus vel planus, griseocanescens, glabrescens, ad centrum atrobrunneus; odor et gustus
mitis. Lamellae confertae, latae, adnatae, griseae demum obscure cinnamomeae, brunneomaculatae. Stipes 2-3.5 cm longus, 1.5-3 mm
crassus, rufobrunneus, griseo-fibrillosus, tarde striatus. Velum cinereum, evanescens. Sporae 8-10 (11) x 5-6 pLm, in "KOH" ochraceae,
subleves, oblongae vel ellipsoideae, non dextrinoideae. Cheilocystidia
versiformia: 18-27 x 8-15 (Im, utriformia vel clavata; 36-40 x 8-11
x 4-6 pLm, elongate fusoid-ventricosa, + 50 x 6-8 p.m, elongate
clavata.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
88697; legit prope Independence Pass, Pitkin County, Colorado, 23 Jul
1978, Evenson and Smith.
Pileus 1-3.5 cm broad, obtuse to convex, becoming plane, surface viscid but soon dry, grayish hoary at first from a thin coating of
veil fibrils, blackish brown beneath the canescence, cinnamon-brown
in age. Context concolorous with the moist surface, odor none, taste
mild; FeSO4 staining stipe base olive-black.
Lamellae broad, close, adnate, at first grayish, in age ~ "Verona
Brown," edges stained darker in age but not beaded (and stains not
resulting from dried droplets).
Stipe 2-3.5 cm long, 1.5-3 mm thick, equal, tubular, cortex dull
brown; surface reddish brown and decorated with a thin coating of