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

The Subgenus Hebeloma

73

edge of a forest, Seattle, Washington, October 20-November 1, 1911,
Murrill 295 (NY). Apparently known only from the type collection.
Observations.-The color of the dried cap is about like that of
Naematoloma sublateritium (Fr.) Karsten at least on the disc. As dried,
the stipe appears to be the type that darkens from the base up in age,
though this is obscured by the white fibrils of the veil. Murrill described it simply as white. For H. mesophaeum he described the stipe
as "becoming rusty"-which shows he was aware of this feature in this
group. The distinctive combination of features shown by Murrill's type
is: the brick red disc of the pileus; the thick stipe not discoloring
markedly, and a copious white veil. The ixocutis of the pileus is better
developed than in var. mesophaeum, but, as in most of the distinguishing characters, the difference is one of degree. For this reason we
reduce the species to varietal status under H. mesophaeum.
35b. Hebeloma mesophaeum var. velovinaceum var. nov.
Pileus 2-3.5 cm latus, late convexus, glaber, subviscidus, griseovinaceus, odor et gustus mitis. Lamellae "Vinaceous-Buff" demum ~
cinnamomeae, latae, subdistantes. Stipes 3-4 cm longus, 3-4 mm crassus, deorsum attenuatus. Velum "Vinaceous-Buff." Sporae 8-11 x 5 -6.5 Ixm, ovoideae vel ellipsoideae, non dextrinoideae. Cheilocystidia
38-64 x 6-11 ILm, filamentosa, subcapitata vel fusoide ventricosa.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
51374; legit prope Lizard Head Pass, San Juan County, Colorado, 27
Jul 1956.
Pileus 2-3.5 cm broad convex becoming plane, margin incurved at
first, glabrous, subviscid but soon dry, opaque, color a grayish vinaceous-brown (in the herbarium + "Sayal Brown"). Context thin,
brownish, odor and taste mild.
Lamellae broad, subdistant, depressed adnate, vinaceous-buff becoming + cinnamon, edges neither beaded nor spotted.
Stipe 3-4 cm long, 3-4 mm thick near apex, equal or narrowed
downward, bister at base; surface fibrillose from veil remnants which
are pale vinaceous (pinkish gray), no annular veil-line evident.
Spores 8-11 x 5-6.5 IJm, ovoid to ellipsoid, wall thin and appearing smooth, pale ochraceous in KOH singly, pale rusty brown in
Melzer's but soon paler on standing (not dextrinoid).
Hymenium.-Basidia 4-spored, 7-10 [tm wide. Pleurocystidia
none. Cheilocystidia elongate-clavate to narrowly fusoid-ventricose,
38-64 x 6-11 Ium or + cylindric and up to 80 x 5 tm, the apex
obtuse to subcapitate, hyaline, somewhat refractive.
Lamellar and pilear tissues.-Cuticle of pileus an ixolattice (very