Family: Incertae Sedis
Xanthoriicola physciae (Kalchbr.) D. Hawksw.
Lichenicolous fungus, mostly parasitic on Xanthoria parietina. Widespread
References:
Smith et al. editors (2009) The Lichens of Great Britain and Ireland
Dobson (2018) Lichens: an Illustrated Guide to the British and Irish Species