Ocellularia portoricensis is a rare species of corticolous (bark-dwelling) crustose lichen in the family Graphidaceae.

Phylogenetically, molecular sequence data suggests a close kinship with two other species: O. polydiscus and O. xanthostromiza, both of which possess pale yellow pigments in the medulla.

Its thallus, which spans up to 10 cm (4 in) in diameter, is olive-green to yellowish-green in colour, and boasts a coarse, densely verrucose surface.

[2] The ascomata, or fungal reproductive structures, has a complete thalline margin, and a black columella, visible as a thin, whitish rim around the pore.

Brown ascospores are a rarity in genus Ocellularia and are also seen in the distantly related O. allospora, which lacks secondary substances and has a smooth thallus with emerging ascomata.