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

The Subgenus Hebeloma

105

52. Hebeloma subhepaticum sp. nov.
Illus. Figs. 28-29.
Pileus 2-4 (6) cm latus, convexus demum + planus, glutinosus,
incarnato-griseus demum obscure vinaceobrunneus vel subhepaticus,
glaber; odor mitis, gustus + farinaceus. Lamellae pallide incarnatogriseae demum rufobrunneae, latae, confertae, adnexae. Stipes (3) 5-6
cm longus, 3-8 (10) mm crassus, tenuiter fibrillosus, glabrescens, deorsum brunnescens, sursum pallidus. Sporae 8-10 x 5-5.5 [tm, verruculosae, dextrinoideae, in "KOH" obscure fulveae, inequilaterales. Cheilocystidia 18-26 x 3-4 Lm, subventricose vel tibiiformes. Cuticula pileorum ixotrichoderma est.
Specimen typicum in Herb. Univ. Mich. conservatum est, Smith
18029; legit prope Cape Flattery, Washington, 19 Oct 1941.
Pileus 2-4 (6) cm broad, convex with an incurved margin, becoming plane or nearly so; surface slimy-viscid, dingy vinaceous-buff at
first, darkening through "Verona Brown" to "Warm Sepia" or liverbrown, a redder liver-brown when dried, margin long remaining paler.
Context watery but firm, colored about like the pileus; odor and taste
mild or taste + farinaceous.
Lamellae broad, close, soon adnexed, pale vinaceous-buff becoming darker (like the pileus), as dried distinctive dark reddish
brown, edges even and concolorous with the faces.
Stipe (3) 5-6 cm long, 3-8 (10) mm thick, equal, pallid above,
surface ~ floccose from remains of a thin evanescent veil, + glabrescent, striate at times, soon dark brown at the base, hollow at maturity.
Spores 8-10 x 5-5.5 pm, minutely roughened, dextrinoid and in
KOH dull rusty brown, paler singly, in profile view inequilateral, in
face view ovate.
Hymenium.-Basidia 26-31 x 7-9 ptm, 4-spored. Pleurocystidia
none. Cheilocystidia very small, 18-26 x 3-4 Vfm, narrowly ventricose
to tibiiform.
Lamellar and pilear tissues.-Lamellar trama hyaline in KOH, in
Melzer's the whole mount flushed red on standing a short time. Cuticle
of pileus an ixotrichodermium collapsing to an ixolattice, the hyphae ~
1.5 JLm diam, branched, hyaline in KOH, clamps present. Hypodermium hyphoid, merely separated from trama proper as a colored reddish zone in Melzer's, as revived in KOH rusty brown.
Habit, habitat, and distribution.-Scattered to gregarious under
Sitka spruce, Pacific Northwest: Wahington to California. Collections:
Smith 56753, 56757, 56838, 57020, 57047, and (type, MICH 18029).