Summary: Features include very small size, a pendant white finely fibrillose cup (concave surface facing downward), a smooth to slightly wrinkled spore bearing surface that faces down, growth on moss and adjacent soil or decayed wood, and round, smooth, inamyloid spores. The description is derived from Redhead(7).
Gills: smooth to only slightly wrinkled; white with slight buff tint
Stem: cap "narrowly to broadly attached centrally or eccentrically"
Microscopic spores: spores 4-5(6) x 4-5 microns, round or nearly round or broadly pip-shaped, smooth, nonamyloid, colorless, with pronounced walls and apiculus; basidia 4-spored, 24-26 x 6.5-7.2 microns, clavate even when young, colorless; tramal hyphae mostly 5-11(20) microns wide in more mature fruitbodies, subparallel to loosely interwoven, smooth, nonamyloid, clamped, with thin to pronounced walls; pellicular hyphae similar but less inflated, 5-6 microns wide, relatively undifferentiated except toward the margins in older fruitbodies where sparse diverticula or irregular short branches are infrequent
Spore deposit: [presumably whitish]
Notes: Collections were examined from BC, OR, MB, ON, NY, and France, (Redhead).
EDIBILITY
Habitat and Range
SIMILAR SPECIES
Rimbachia neckerae has elliptic spores. Rimbachia bryophila has gill-like radiating folds.
Habitat
occasionally somewhat confluent where crowded, more often borne among or associated with mycelial strands on substrates; on moss leaves, usually on undersides or along stems, often of Mnium sensu lato and also on adjacent substrate such as soil or decayed wood, in hardwood or mixed forests