Pyrenula maritima

About

Pyrenula maritima is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. The species forms smooth pale olive to yellowish-brown patches on twigs and small branches, with fruiting bodies that are either immersed in the thallus or form slightly raised black hemispheres. It is known from coastal shrubland in the arid zone of central Chile, where it grows in sites regularly affected by fog from the Pacific Ocean.

Summary from Wikipedia