Herpothallon granulare

Herpothallon granulare is a species of lichen-forming fungus in the family Arthoniaceae. It forms distinctive white and greenish-grey growths primarily on trees in tropical regions worldwide. This lichen reproduces mainly through vegetative means rather than spores, and is particularly common in the Galápagos Islands where it grows in semi-shaded to shaded environments from the transition zones through humid areas. It has also been documented in India, Sri Lanka, and other tropical locations, where it grows on various native and introduced trees, occasionally appearing on leaves....read more on Wikipedia.