Phylum: Basidiomycota Family: Hydnaceae
Sistotrema brinkmannii (Bres.) J. Erikss.
Widespread but not particularly common. It grows on fallen timber of many tree species of both broadleaf and conifer
References:
Bernicchia & Gorjon (2010) Fungi Europaei 12: Corticiaceae s.l.
Hugill & Lucas (2019) The Resupinates of Hampshire