Cinereomyces lindbladii is a poroid wood-decay fungus in the family Polyporales (Basidiomycota), found across Europe and extending into parts of North America and Asia. It produces annual, bracket-like or resupinate fruiting bodies on dead and decaying wood, particularly the trunks and branches of broadleaf trees such as birch, beech, and alder in old-growth and mature woodland. The pore surface is white to grayish and finely textured, with very small pores through which spores are released. The species is classified as Least Concern, reflecting a broad distribution across temperate forest zones. Cinereomyces lindbladii is a white-rot fungus, degrading lignin and cellulose and playing an important role in the decomposition of coarse woody debris in forest ecosystems. This process returns nutrients to the soil and creates habitat for a diverse array of saproxylic invertebrates, lichens, and bryophytes. The species is associated with old-growth and mature woodland conditions where a continuous supply of large dead wood is available. Decreases in saproxylic fungi generally correlate with intensive forest management that removes dead wood. The genus Cinereomyces was established for this and closely related species based on molecular and morphological work clarifying their position within the polypore diversity of Polyporales.