Phaeographis australiensis

About

Halegrapha mucronata is a species of bark-dwelling script lichen in the family Graphidaceae. It forms a whitish-grey crust on tree bark and produces dense, black, slit-like fruiting bodies. The species has a complex taxonomic history, having been placed in several different genera before being transferred to Halegrapha in 2011. It occurs in Australia and New Zealand, where it is common in coastal scrub and woodland.

Summary from Wikipedia