Pyrenula cornutispora

About

Pyrenula cornutispora is a species of corticolous (bark-dwelling) crustose lichen in the family Pyrenulaceae. The species forms a thin smooth yellowish-brown crust on tree bark and produces tiny hemispherical fruiting bodies 0.4–0.7 mm across that are largely covered by the thallus except for tiny black pores at the top. It is characterized by distinctive horn-shaped spores with tapered, pointed ends that often curve slightly, and is known only from Amazonas state in Brazil.

Summary from Wikipedia