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.
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).
Fruiting body:
resupinate, pulvinate [cushion-shaped], 0.05-0.2cm thick, mostly small, 1-2cm, "usually extended in the direction of the wood grain and sometimes confluent to longish fruitbodies", tough, almost suberose; whitish, pale grayish to pale ochraceous; when dry more or less rimose [cracked]; margin abrupt, finely fibrillose under hand lens, (Eriksson), "developing in small, often confluent patches"; white to cream; pilose under 10x lens, (Gilbertson)
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)
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