Pyrenula montocensis

Pyrenula montocensis is a species of corticolous (bark-dwelling), crustose lichen in the family Pyrenulaceae. It forms a thick yellow to olive-green crust on tree bark, with many tiny surface pores and crystal-like bumps around its fruiting bodies. The fruiting bodies appear as small, rounded bumps that are partly embedded in the crust, and the species can be confirmed under the microscope by its exceptionally large ascospores divided by three internal walls. It was known only from a single collection made near San José in 1929, and the original description suggested it may have disappeared from the now-urban type locality. It has since been recorded in Colombia....read more on Wikipedia.