Architrypethelium nitens

Architrypethelium nitens is a species of corticolous (bark-dwelling), crustose lichen in the family Trypetheliaceae. It was first described in 1824 as Verrucaria nitens, and later transferred to Architrypethelium. The lichen forms a smooth, glossy, olive-green crust on bark, with small black, flask-shaped fruiting bodies (perithecia) that are usually partly covered by the thallus. It is a Neotropical species, recorded from Costa Rica, and it can be recognized under the microscope by its large, dark brown ascospores with three internal partitions and a clear, jelly-like outer sheath....read more on Wikipedia.