Diorygma fuscum

Diorygma fuscum is a species of corticolous (bark-dwelling) crustose lichen in the family Graphidaceae. It forms thin, pale grey crusts on bark surfaces and produces distinctive slit-like reproductive structures that are dusted with white powder (pruina). The lichen reproduces through ascospores that have a brick-like internal structure with multiple compartments, and it contains several lichen substances that help distinguish it from related species. The species was first scientifically described in 2016 from specimens collected in Fujian Province. Diorygma fuscum is known only from low-elevation primary forests in China, where it grows alongside other bark-dwelling lichens....read more on Wikipedia.