Summary:
Features include 1) 1-2cm, tough, pulvinate patches on wood, 2) color that is whitish, pale grayish to pale ochraceous, 3) spores that are large, fusiform to crescent-shaped, smooth, inamyloid, and colorless, 4) long, slender basidia, 5) cystidia that are abundant, long, cylindric to narrowly clavate, encrusted, and thick-walled, with the wall thinning out at the apex, and 6) dense vertical hyphae with clamp connections.

Microscopic:
SPORES 12-16 x 4-6 microns, fusiform [spindle-shaped], more or less arcuate [crescent-shaped], smooth, inamyloid; BASIDIA 4-spored, 100 microns long and 5-7 microns wide, (very long and slender), usually with a fine grainy encrustation, sterigmata about 6-8 microns long; CYSTIDIA "very long, up to 300 microns, projecting 15-50 microns, thickwalled and finely encrusted or apically with some larger crystals"; HYPHAE "monomitic, consisting of vertical, densely interwoven hyphae, mostly 2-3 microns wide and with clamps at all septa, thinwalled or slightly thickwalled, old hyphae often with a fine grainy encrustation", (Eriksson), SPORES 12-18 microns long, inamyloid, colorless; BASIDIA "long and slender, up to 100 microns long, 5-6 microns wide", narrowly clavate; CYSTIDIA "very abundant, cylindric to narrowly clavate, thick-walled, wall thinning out at apex"; hyphae with clamp connections, (Gilbertson)

Notes:
Chaetodermella luna has been found in BC, WA, ID, AB, YT, AK, AZ, CO, MT, NM, UT, and WY, (Ginns), and Norway and Sweden, (Eriksson).

Synonyms and Alternate Names:
Ciboria sydowiana Rehm
Ombrophila sydowiana Rehm