Pileus 12-28 mm broad, broadly convex to plane, surface matted fibrillose, ± viscid when fresh and moist, “Verona Brown” to “Clay Color”; the margin paler and (in age) pinkish buff. Context thick, pink- ish buff; odor distinctive but not identifiable, taste strongly farinaceous.
Lamellae broad, broadly adnexed, close(?), thin, acute at the pileus margin, not beaded.
Stipe 2-3 cm long, 2-4 mm thick, ± equal, brownish pallid above, darker below (as dried), appressed silky or with sparse pale tan fibrils of the veil in a zone near the apex (on dried specimens).
Spores 9-12 × 5.5-6.5 jJ.m, ellipsoid to ovoid (the H. meso- phaeum type), thin-walled, nearly hyaline varying to brownish in KOH, slightly darker in Melzer’s but not dextrinoid.
Hymenium.-Basidia 4-spored, 9-12 jJ.m wide near apex. Pleuro- cystidia none. Cheilocystidia 52-73 x (3) 4-6 jJ.m diam, subcylindric to filamentous, hyaline, not agglutinated.
Lamellar and pilear tissue.-Lamellar trama typical for the genus. Cuticle of pileus an ixocutis, thin and the hyphae 1-2.5 (3) jJ.m diam, clamped (some hyaline veil hyphae 4-7 jJ.m diam at times matted on surface but these not refractive in water or KOH mounts). Hypo- dermium hyphoid, ± tawny in KOH, speckled with pigment incrusta- tions or wall thickenings or both. Tramal hyphae of pileus merely yellowish in Melzer’s.
Habit, habitat, and distribution.-Scattered to gregarious on soil under lodgepole pine and willow, August 13, 1956, Black’s Fork, Utah, collected by Kent McKnight (type, MICH).