[1] The specific epithet honours Belgian lichenologist Emmanuël Sérusiaux, a colleague of the author who accompanied him on some collecting expeditions in the country.

[2] The type was collected in the Balek Wildlife Sanctuary in Madang Province, where it was found growing on Macaranga tree trunk in the relics of a secondary forest.

[1] The lichen has a thallus that is immersed in the bark of its host, lacks a cortex, and appears as a greenish discoloration that is up to 5 cm (2 in) wide.

The ascomata are more or less spherical, and small (measuring 0.2–0.4 mm in diameter) with black walls.

The ascospores, which number 8 per ascus, are spindle-shaped (fusiform), have 3 septa, and feature angular, diamond-shaped lumina (interior spaces).