Enterographa perezhigaredae

Enterographa perez-higaredae is a species of lichen-forming fungus in the family Roccellaceae. It is a leaf-dwelling lichen known from Mexico and has also been reported from Thailand and Sint Eustatius (Caribbean Netherlands). It forms pale grayish to whitish-green patches on the upper surfaces of living leaves. The species is distinguished by its rounded, wart-like fruiting bodies (rather than the narrow elongate structures typical of most Enterographa species) with brown discs and pale margins, and by the presence of conspicuous gray crystals in the internal tissues....read more on Wikipedia.