Clitocybe leucodiatreta is a pale agaric fungus in the family Tricholomataceae native to temperate European forests. The species name combines 'leuco' (white) with the related species epithet 'diatreta,' suggesting morphological similarity to Clitocybe diatreta but with a distinctly paler, more whitish appearance. It inhabits deciduous and mixed woodland floors, fruiting in autumn among accumulated leaf litter where it acts as a saprotrophic decomposer of organic matter. The fruiting bodies display the characteristic Clitocybe form: a depressed to funnel-shaped cap, crowded decurrent gills, and a cylindrical stipe. Distinguishing closely related small, pale Clitocybe species requires careful examination of spore morphology, odor, taste, and ecological context, with molecular phylogenetics increasingly used to resolve taxonomic boundaries within this challenging genus. C. leucodiatreta represents part of the remarkable diversity of saprotrophic fungi in European temperate forests, ecosystems where macrofungal diversity rivals that of the plant and invertebrate communities they help sustain through decomposition.