Pileus 1.5-4 (6) cm broad, convex to obtusely campanulate, sur- face subviscid, brownish drab to dingy orange-cinnamon to “Sayal Brown” (dull cinnamon) very hoary overall at first from a coating of pallid veil fibrils, in age often covered with minute appressed squam- ules before becoming glabrous, opaque at all stages. Context watery brown fading to pale buff, taste slight (faintly farinaceous), odor not distinctive; FeS04 on stipe base instantly blackish green, on the pileus slowly olive.
Lamellae near avellaneous when young, becoming “Sayal Brown,” narrow, close, adnate, edges even.
Stipe 2-4 (6) cm long, 2-5 (8) mm thick, equal, rigid, ragged from veil remnants and often with an evanescent annular zone or simply thinly fibrillose, glabrescent, soon bister at the base and the color change progressing upward but apex remaining pallid.
Spore deposit “Clay Color” as air-dried. Spores 8-10 (11) x 5- 6.5 f.Lm, appearing smooth in KOH, in Melzer’s minutely punctate under oil immersion, not dextrinoid, shape in face view ovate to ellip- tic, in profile elliptic to ± bean-shaped.
Hymenium.-Basidia 4-spored, 7-9 f.Lm broad, containing numer- ous hyaline globules as revived in KOH. Pleurocystidia none. Cheilo- cystidia elongate fusoid-ventricose, 38-66 × 7-11 × 3-5 f.Lm, subacute to obtuse, rarely forked at a short distance below the apex, some present as filaments 3-5 f.Lm diam, hyaline at first but in age aggluti- nated and the masses rusty brown as revived in KOH or in Melzer’s. Gill trama typical of the genus.
Cuticle of pileus a poorly defined layer of hyphae 3-4.5 J.Lm wide with only subgelatinous walls and an outer area of veil hyphae 4-7 f.Lm diam. Hypodermium a layer of rusty brown, wide hyphae appearing cellular in tangential sections, incrustations present but inconspicuous. Pileus trama of ± radial-interwoven hyphae with inflated cells and some dextrinoid debris present. Clamps present.
Habit, habitat, and distribution.-Densely gregarious on an out-wash of a stream, Elk Camp, Burnt Mt., Pitkin County, Colorado, July 14, 1979 (type, MICH).