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

172

The Veiled Species of Hebeloma

Lamellae broad, close, rounded-sinuate, "Fawn Color" becoming
"Sayal Brown," edges even, neither beaded nor spotted.
Stipe 4-7 cm long, 2.5-3.5 mm thick, equal, cartilaginous, hollow, "Fawn Color" but becoming darker below; grayish fibrillose from
the remains of the grayish fibrillose veil.
Spores 9-12 x 5.5-6.5 (7) pm, elliptic to obscurely ovate in face
view, in profile subelliptic to very weakly inequilateral in profile, apex
rounded, wall + buffy hyaline in KOH, not dextrinoid, clay color in
Melzer's and very minutely punctate.
Hymenium.-Basidia 4-spored, 8-9 JIm broad near apex, not red
in Melzer's (but material poorly dried). Pleurocystidia none. Cheilocystidia 37-63 x 7-11 x 4-5 (7-8) pJm, elongate fusoid-ventricose
finally but many not greatly elongated, some in age spathulate at the
apex (with a tendency to fork), often shaped like a hockey stick in age.
Lamellar and pilear tissues.-Lamellar trama typical of the genus,
not truly red in Melzer's but in places orange-ochraceous. Cuticle of
pileus an ixotrichodermium becoming an ixolattice, hyphal ends 1.5-2
pJm diam, the elements tubular, not infrequently branched, copious
slime in the layer in material revived in KOH; basal to the ixotrichodermium are found + hyaline hypodermial (?) hyphae 5-12 Jtm diam
with hyaline ~ refractive walls in KOH. Hypodermium proper a narrow zone of fulvous (in KOH) hyphae with short to elongated cells 8 -18 Jim diam. Tramal hyphae yellow in Melzer's. These seemingly typical of the genus.
Habit, habitat, and distribution.-Gregarious in muck on swampy
ground, Lakeland, Livingston County, Michigan, October 15, 1932
(type, MICH).
Observations.-The fragrant odor, H. mesophaeum-like spores,
pale gray veil, and pale vinaceous-brown ("Fawn Color") pileus are an
important combination of characters in this genus.
103. Hebeloma pascuense Peck (j)
Ann. Rep. N.Y. State Mus. 53: 844. 1900
Illus. Peck, l.c., pl. C, bottom.
Pileus 2-5 cm broad, convex becoming nearly plane, viscid when
moist, obscurely innately fibrillose, brownish clay color, often darker
or rufescent on the disc, margin at first slightly whitened by the thin
webby veil. Context whitish, taste mild, odor weak, resembling that of
radishes.
Lamellae close, rounded behind, adnexed narrow to moderately