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

52

The Veiled Species of Hebeloma

Brown" at maturity, often with dingy rusty brown stains in age, edges
even.
Stipe 3-5 cm long, 2.5-4 mm thick at apex, equal or enlarged
downward, pallid when young or with only a tinge of brown, becoming
dingy brown from the base upward, appressed fibrillose from remains
of a pallid veil, apex finely pruinose.
Spores 8-11 x 5-6 tm, elliptic to obscurely ovate in face view,
in profile view subelliptic to obscurely bean-shaped, appearing smooth
(under light microscope), nearly hyaline in KOH, not dextrinoid.
Hymenium.-Basidia 4-spored. Pleurocystidia none. Cheilocystidia 50-80 x 8-11 x 4.5-7 pLm, apex obtuse, near base slightly ventricose, the neck greatly elongated, thin walled, smooth.
Lamellar and pilear tissues.-Lamellar trama hyaline or nearly
so (typical for the genus). Cuticle of pileus an ixocutis, hyphae 2-4.5
[Lm diam, hyaline, walls refractive, clamps present. Hypodermium
hyphoid.
Habit, habitat, and distribution.-Gregarious on moss in sandy
soil, Rhododendron, Oregon, under pine and hemlock; October 1,
1944 (type, MICH).
Observations.-H. nigellum Bruchet has larger spores (11-13 x
6.5-7.5 iLm) and a less sharply defined ixocutis. Both have very dark
colored pilei, but in drying pilei of H. nigromaculatum are buff on the
margin and + pale "Verona Brown" over the disc-the blackening
disappears.
21. Hebeloma brunneomaculatum sp. nov.
Illus. Fig. 27A.
Pileus 2-4 cm latus, convexus, deinde planus vel umbonatus, cinnamomeo-brunneus, demum + aurantiobrunneus, subviscidus, demum
brunneomaculatus, ad marginem fibrillosus. Velum pallide argillaceum.
Odor distinctus sed non raphaninus vel fragrans. Lamellae latae, adnatae, confertae, brunneolae deinde obscure cinnamomeae. Stipes 4.5-5
cm longus, 4-7 mm crassus, brunneus, fibrillosus. Sporae 7-9 x 5-5.5
pim, in cumulis fulvae, ovoideae vel ellipsoideae, subleves, non dextrinoideae. Cheilocystidia 36-58 x 7-8 x 4-5.5,pm, + fusoid-ventricosa.
Specimen typicum in Herb. Univ. Mich. conservatum est, WellsKempton 7; legit prope Matanuska River Campground, Alaska, 20
Aug 1966.
Pileus 2-4 cm broad, convex with the margin connivent, expanding to plane or retaining a low umbo, hygrophanous, when moist
cinnamon-brown, distinctly paler when faded and a medium orange