Phylum: Basidiomycota Family: Microbotryaceae
Microbotryum saponariae M. Lutz, Göker, Piątek, Kemler, Begerow & Oberw.
A rare fungus in Britain, but widespread on the continent, growing on the anthers of Saponaria officinalis. It also infects cultivated species but to what extent is not known
References:
Woods, R.G. et al. (2018) Smut and Allied Fungi of Wales
Redfern, M. & Shirley, P. (2011) British Plant Galls