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

136

The Veiled Species of Hebeloma

except that in Melzer's mounts it becomes red and soon fades to yellowish, the color being located in the cell walls; subhymenium remaining orange in some sections. Cuticle of pileus an ixocutis of slimecoated hyphae 3-6 pIm diam, the hyphae widely separated in the layer
by the slime. Hypodermium rusty red-brown in Melzer's, + tawny in
KOH, hyphoid, some incrustations present but these not prominent.
Tramal body in part red in Melzer's but soon fading (most highly
colored near the hypodermium). Clamps present.
Habit, habitat, and distribution.-Collected along a road at University Woods, Fairbanks, Alaska, August 17, 1971 (type, MICH),
caespitose. The collectors reported it abundant throughout the area.
Observations.-This veiled species connects to members of subgenus Denudata in such characters as the bulkiness of the basidiocarps,
the copious formation of droplets on the young gills, the agglutination
of the cheilocystidia in age, scarcity of fusoid-ventricose cheilocystidia,
the dextrinoid spores and the + scaly stipe. The versiform cheilocystidia and the ixocutis of the pileus distinguish the species from H.
insigne which features an ixotrichodermium for a pilear cuticle. The
cottony veil would appear to be fairly similar in both. More study of
these two in relation to H. sinapizans is needed.
76. Hebeloma subrubescens sp. nov.
Illus. Figs. 49-50.
Pileus 2-5 cm latus, convexus demum planus vel late umbonatus,
ad marginem albofibrillosus, ad centrum badius ("Prout's Brown" vel
"Benzo Brown" demum rufobadius vel rubrovinaceus); odor et gustus
mitis demum + pungens. Lamellae confertae, latae, adnatae, obscure
cinnamomeae, serrulatae. Stipes 4-8 cm longus, 3-7 mm crassus, striatus, dissiliens, deorsum demum fulvus. Velum fibrillosum, album demum leviter ochraceum. Sporae 11-14 x 6.5-8 pm, in "KOH" +
leves, non dextrinoideae, inequilaterales. Cheilocystidia clavata, 10-16
pjm crassa, vel fusoide ventricosa, 36-72 x 7-16 RJm; vel filamentosa,
4-6 (Im diam.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
90090; legit prope High Alpine Springs, Snowmass Village, Pitkin
County, Colorado, + 11,000 ft elevation, 30 Aug 1979.
Pileus 2-5 cm broad, margin inrolled at first, many with white
patches of veil fibrils, disc bay to dark red but at first "Prout's Brown"
to "Benzo Brown," becoming redder and paler as the pileus ages, in
late button stages the margin at times fringed with fibrils; KOH on
cuticle staining it dark brown, with FeSO4 olive-gray (the same on the
base of the stipe); odor and taste mild to slightly pungent.