Summary:
Features include 1) small size, 2) a convex, umbonate, dry, buff to ochraceous cap with the margin often uneven, 3) adnate, winy buff to whitish gills, 4) an equal stem colored as the cap, 5) a mild to farinaceous odor, 6) a farinaceous then bitter taste, 7) white spore deposit, and 8) microscopic characters: cheilocystidia may be present and there are abundant incrusting pigments in the upper tramal area. This is a variable species somewhat intermediate between Collybia and Clitocybe. Pacific Northwest Clitocybe species with cystidia are C. intermedia and C. martiorum. Redhead(4) gives Clitocybe fellea Peck as a synonym of Clitocybe incomis (P. Karst.) P.D. Orton, and Bigelow''s description of Clitocybe fellea Peck is included here as well. Note however that the current name of Clitocybe fellea in the online Species Fungorum, accessed November 8, 2020, is Pseudolaccaria fellea (Peck) Vizzini, Matheny, Consiglio and M. Marchetti (rather than Pseudolaccaria pachyphylla). Bigelow gives Clitocybe vulgaris (Singer) Singer and Collybia vulgaris Singer as synonyms of Clitocybe fellea Peck.

Gills:
adnate, sometimes with short decurrent extension, sometimes slightly adnexed, usually becoming ventricose when old, moderately spaced, 1-2 tiers of subgills; vinaceous buff to buff or whitish, often developing yellowish tints especially toward cap margin, (Redhead), broadly adnate for some time, rarely subsinuate [somewhat sinuate], finally short-decurrent, close to subdistant, broad (0.3-0.6cm), sometimes triangular or arched, brittle, not forked; whitish or pallid to faintly avellaneous ("pale pinkish buff", "cartridge buff", "vinaceous buff"); not interveined, (Bigelow)

Stem:
2.3-4cm x 0.1-0.25cm, mostly equal and often slightly sinuous [curving], round in cross-section to compressed, cartilaginous, hollow; colored as cap; dry, "finely striate and often finely fibrillose, usually with conspicuous appressed cottony white basal mycelium", (Redhead), 1.5-4.5(6)cm x 0.1-0.3(0.6)cm at top, usually equal, tough, solid at first becoming hollow when old, often curved and somewhat flexuous [wavy], sometimes compressed; colored as cap or slightly paler; fibrillose-striate for some time, finally appressed and appearing bald, "base sometimes with a few white rhizoids", (Bigelow)

Veil:
[presumably none]

Odor:
indistinctive to faintly or strongly farinaceous or faintly rancid, (Redhead), farinaceous but fading (Bigelow)

Taste:
similar to odor or somewhat bitter, (Redhead), "bitter, often farinaceous also at first", (Bigelow)

Microscopic spores:
spores 7.5-11 x 5-6 microns, broadly elliptic (less often obscurely broadly reniform [kidney-shaped], oboval, or cylindric), smooth, inamyloid, colorless, thin-walled, broadly apiculate; basidia 4-spored, 28-31 x 8-9 microns, clavate, not carminophilous; cheilocystidia "absent to scattered or abundant but not forming a sterile edge", 25-70 x 6-7 microns, "narrowly fusoid ventricose, sometimes forked or slightly contorted on the elongated neck, sometimes basidiole-like and merely mucronate or aculeate", thin-walled, colorless; cap cuticle a radially repent layer of brownish incrusted hyphae 5-12 microns in diameter with frequent erect often fasciculated cystidioform ends with nonincrusted or faintly incrusted walls, cap and gill tramal hyphae similar but less incrusted than those of the pellis; clamps present on all hyphae, (Redhead), spores 6-8(9) x 4.5-5.5(6.5) microns, broadly elliptic, smooth, inamyloid; basidia 4-spored or also 2-spored, 25-38.5 x 6.5-8 microns; [pleurocystidia and cheilocystidia not noted but see above], clamp connections present, (Bigelow), spores 6.5-8.5(10.5) x (4.5)5-6(7) microns, weakly amyloid (MycoQuebec)

Spore deposit:
white (Bigelow)

Notes:
Redhead examined collections of Clitocybe incomis from BC, NB, QC, MA, NY, Finland, and Sweden, (Redhead(4)). Bigelow examined collections as Clitocybe fellea Peck from WA, OR, ID, QC, CA, MA, ME, MI, MN, NH, NY, and VT, (Bigelow(5)).

EDIBILITY

Synonyms and Alternate Names:
Pseudoomphalina pachyphylla (Fr.) Knudsen