Pyrenula microcarpa

Pyrenula microcarpa is a species of corticolous (bark-dwelling), crustose lichen in the family Pyrenulaceae. It has a pantropical distribution. The lichen was formally described as a new species in 1885 by Johannes Müller Argoviensis. It has a white to grey-coloured thallus with ascomata measuring up to 0.7 mm in diameter.