The holotype specimen was collected by the second author on Pinta Island at an elevation of 615 m (2,018 ft); it was found in a forest of Zanthoxylum fagara with abundant ferns in the understory.

[2] The lichenicolous fungus initially grows immersed within the host lichen, eventually bursting through and appearing as black, star-shaped or rounded structures measuring 1–2 mm in diameter.

Plectocarpon aequatoriale, found in Ecuador, has distinctly convex ascomata, longer ascospores, and a different host genus.

Opegrapha plectocarpoidea, known from Papua New Guinea, differs in its ascomatal shape, number of spores in its asci, and the exciple that continues below the hymenium.

It grows on Sarcographa tricosa sensu lato, which is found on twigs and branches of Chiococca alba trees in the forest understory of Zanthoxylum fagara on Pinta Island.