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

ifers, Independence Pass, Pitkin County, Colorado, July 27, 1976
(type, MICH).
Observations.-The two types of cheilocystidia are not as valuable a feature here as one might expect because some clavate cells
appear on or near the gill edge in many of the small veiled species.
Hebeloma sterlingii (Pk.) Murrill is close to H. griseovelatum but distinguished by a farinaceous taste and the interior of the stipe is said to
be bay-red. H. griseovelatum is also close to H. testaceum sensu Bruchet but differs in not having a distinctive odor and taste. Also, its
pileus is scarcely viscid and the veil is distinctly grayish.
69. Hebeloma piceicola sp. nov.
Illus. P1. 6A; figs. 41-42.
Pileus 1-2 cm latus, demum plano-umbonatus, canescens, ad
marginem fibrillosus, glabrescens, griseobrunneus. Odor et gustus raphanicus. Lamellae latae, confertae, adnatae, vinaceopallidae demum
subcinnamomeae. Stipes 2.5-3.5 cm longus, 3-4.5 mm crassus, "Vinaceous-Buff," deorsum sordide brunneus, fibrillosus. Sporae 10-12.5
x 6-7 Ixm, + dextrinoideae. Cheilocystidia 43-58 x 4-6 JIm, subcapitata.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
89135; legit prope Elk Camp, Burnt Mt., Pitkin County, Colorado, 25
Aug 1978.
Pileus 1-2 cm broad, obtuse then expanding to plano-umbonate,
hoary at first from fibrils of an outer veil, patches of veil fibrils along
the margin persisting for some time, ground color gray-brown ("Wood
Brown"), opaque at all stages. Context dark watery brown, odor and
taste + raphanoid; FeSO4 staining the base of the stipe olive-green to
blackish.
Lamellae vinaceous-buff, becoming a pale "Verona Brown,"
broad, adnate to adnexed, close but not crowded, edges neither
beaded nor spotted.
Stipe 2.5-3.5 cm long, 3-4.5 mm thick, equal, + vinaceous-buff
above, becoming bister in the base and the change progressing upward,
surface pallid from the fibrillose veil, the fibrils finally evanescent.
Spores 10-12.5 x 6-7 [xm, surface minutely asperulate in
Melzer's, + dextrinoid, + clay color and smooth in KOH, fading to +
hyaline, shape in profile inequilateral, in face view ovate.
Hymenium.-Basidia 4-spored, 8-10 Vtm broad near apex. Pleurocystidia none. Cheilocystidia + cylindric and 43-58 x 4-6 ptm, only
slightly enlarged at apex and some with an annular zone a short