Tylothallia verrucosa
Tylothallia verrucosa is a lichen in the family,
Lecanoraceae. It was first described as Patellaria verrucosa in 1896
by Johannes Müller Argoviensis.
It is found on a wide range of non-calcareous rocks, exposed to considerable sea-spray, from sea-level to up to 20 metres above the high tide mark.