Cortinarius ultrodistortus should be considered for assessment because it occupies two declining habitat types: long‑continuity calcareous grassland microrefugia and mature, undisturbed broadleaf woodland. Across Europe, both habitats are undergoing fragmentation, nutrient enrichment, and structural change, reducing the availability of stable ectomycorrhizal environments. The species shows a scattered, isolated pattern of occurrence, suggesting vulnerability to further habitat loss. Its reliance on sensitive, slow‑recovering ECM systems means that declines in either grassland or woodland quality directly threaten its persistence. Assessing this species would help highlight the conservation importance of these diminishing fungal habitats and the specialised guilds they support.