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

5. Veil pallid (not appreciably discoloring)............................................................. 35 var. mesophaeum and var. longipes (h) (p. 170)
5. Veil buff colored in young basidiocarps..................... 35d. var. imitatum
6. Veil pallid but soon lutescent on the darkened area of the stipe.................................................... 35e. var. aspenicola
6. Not as above........................................................ 7
7. Pileus + chestnut brown at first; odor and taste + pungent.. 35f. var. castaneum
7. Not as above........................................................... 8
8. At maturity some cheilocystidia spathulate or forked at the apex................................................... 35g. var. bifurcatum
8. N ot as above........................................................ 9
9. Spores 7-9 (10) x 5-5.5 p.m.................... 35h. var. duplicatum
9. Spores 8-10 x 6-7.5 pm................................................ 10
10. Veil grayish; pileus squamulose........................ 35i. var. insipidum
10. N ot as above....................................................... 11
11. Veil pallid; taste farinaceous..................... 35j. var. fiuviatile
11. Veil buff colored........................ 35k. var. similissimum
35a. Hebeloma mesophaeum var. lateritium
(Murrill) comb. nov.
Hebeloma lateritium Murrill, North Amer. Flora 10: 224. 1917.
Pileus 5 cm broad, convex, becoming nearly plane with age, umbonate, surface distinctly viscid, smooth, glabrous, lateritius, margin
entire, not striate, avellaneous or, as moisture escapes, cream color.
Lamellae sinuate, rather broad and ventricose, crowded, pallid to
clay color, conspicuously whitish pubescent on the edges.
Stipe 6 cm long, 7-10 mm thick, enlarged below, white (as described by Murrill), conspicuously fibrillose, fleshy.
Spores 8-11 x 4-5.5 pxm, narrowly ovate in face view, obscurely
bean-shaped to elliptic in profile view, very pale clay color in KOH,
appearing smooth under a 4-mm high-dry objective, walls thickened
somewhat but no apical pore evident, not dextrinoid.
Hymenium.-Basidia both 2- and 4-spored, 26-30 x 6-7 VJm.
Pleurocystidia none. Cheilocystidia 30-73 x 7-11 x 4-6 rim, fusoid
ventricose or some filamentous, neck usually straight, wall hyaline to
yellowish in KOH; not agglutinating and few seen with a slight apical
enlargement.
Lamellar and pilear tissues.-Lamellar trama typical for the genus. Cuticle of pileus an ixolattice of hyaline hyphae 3-5 Ilm diam;
clamp connections present. Pileal trama typical for the genus. Hypodermium a distinct layer of brown hyphae apparently cellular but the
cells reviving poorly. Degree to which incrustations were present on
the elements not established.
Habit, habitat, and distribution.-Gregarious on sandy soil at the