Fissurina immersa

Fissurina immersa is a species of corticolous (bark-dwelling) script lichen in the family Graphidaceae. Described in 2012 from specimens collected near Mudigere in India's Western Ghats, this lichen forms brown, glossy crusts on tree bark in humid evergreen forests. It is distinguished by its slit-like fruiting structures that remain largely embedded in the surface and its unusual spores, which contain only a single large cell divided into brick-like compartments rather than the typical eight smaller spores. The species appears to be endemic to the central-southern Western Ghats and produces norstictic acid, a chemical compound that helps separate it from related species....read more on Wikipedia.