Phylum: Ascomycota Family: Dermateaceae
Pirottaea nigrostriata Graddon
Found on the dead stems of species in the family Apiaceae. Rather common on hogweed
References:
Ellis, M.B. & Ellis, J.P (1997 new enlarged edition) Microfungi on Land Plants: An Identification Handbook
Læssøe, T. & Petersen, J.H. (2019) Fungi of Temperate Europe, Volume 2