Astrothelium nicaraguense

Astrothelium nicaraguense is a species of lichen-forming fungus in the family Trypetheliaceae. The lichen forms an olive-green crust on tree bark with an uneven to somewhat blistered surface texture. Its reproductive structures are either solitary or loosely grouped, appearing as raised bumps covered in greenish tissue with black dots at the top, and each spore sac produces a single large ascospore divided into many small compartments. The species occurs in montane rainforests of Central America and has also been recorded from the Amazon region of Brazil....read more on Wikipedia.