Glyphis

Glyphis is a genus of lichen-forming fungi in the family Graphidaceae. These lichens form pale grey-green to buff crusts on tree bark and are characterized by elongate, often branched fruiting bodies that appear as black script-like slits against the surface due to their deeply darkened margins and walls. The genus has a pantropical to warm-temperate distribution, growing on the shaded trunks and large branches of mature trees in forests from the Amazon rainforest to Asian evergreen forests, where their durable black markings serve as indicators of long-standing tree substrates....read more on Wikipedia.