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

The Subgenus Hebeloma

145

zer's. Pleurocystidia none. Cheilocystidia various: 50-100 x 4-6 (9) x
3-6 jLm, subcylindric and straight to flexuous, or narrowly fusoid-ventricose with greatly elongated necks, apex not or very slightly enlarged,
some shaped like hockey sticks, very variable in size from young to old
specimens; hyaline in KOH, content homogeneous, walls thin.
Lamellar and pilear tissues.-Lamellar trama of parallel hyphae,
the cells mostly elongate and moderately broad (5-12 pLm diam); no
distinct color reaction in Melzer's. Cuticle of pileus an ixocutis to an
ixolattice, hyphae 2-4 Rim diam, hyaline, slime not copious. Hypodermium conspicuously cellular in old pilei and with conspicuous scattered
incrustations on the cell walls. Tramal body typical of the genus, not
colored red as revived in Melzer's (merely yellowish).
Habit, habitat, ad distribution.-Under weeds in a seepage area,
pine and spruce nearby and with willow and alder also present, Burnt
Mt. area, Pitkin County, Colorado, August 1, 1980 (type, MICH).
Observations.-This species differs from H. idahoense in its flaccid context, small size, pallid veil and typically only elongated cells in
the hyphae of the pileus context. They have similar odor and taste,
spore ornamentation, and cheilocystidia.
82. Hebeloma indecisum sp. nov.
Illus. Figs. 47-48.
Pileus 3-4 cm latus, obtusus vel convexus demum planus, canescens, pallide avellaneus deinde luteobrunneus, ad marginem appendiculate squamulosus. Contextus crassus, albus, odor et gustus subraphanicus. Lamellae pallide avellaneae demum subfulvae, confertae, latae,
adnatae. Stipes 4-6 cm longus, 8-12 mm crassus, albidus, deorsum
brunnescens, albofibrillosus, saepe annulatus. Sporae 10-13 x 6-7.5
pxm, in "KOH" subleves, in Melzer's punctatae, non dextrinoideae.
Basidia tetraspora. Cheilocystidia 48-100 x 3-4 x 4-6 ixm, elongatoclavata.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
89584; legit prope Elk Wallow, Pitkin County, Colorado, 28 Jul 1979.
Pileus 3-4 cm broad (all young), obtuse to convex, becoming ~
plane, surface canescent and pale avellaneous at first, about "Buckthorn Brown" to cinnamon-buff when canescence is removed, margin
at first decorated with pallid patches of veil fibrils. Context thick,
white, odor and taste ~ pungent (raphanoid?), FeSO4 staining base of
stipe olive-black instantly.
Lamellae broad, close, adnate, pale avellaneous when young,
becoming dull cinnamon ("Sayal Brown") in age, not beaded.