[1][2] Found exclusively in Réunion, it forms a crustose thallus and is characterised by its rounded ascomata and the presence of specific chemical compounds.

The lichen species Lecanactis borbonica was first formally described by lichenologists Damien Ertz and Anders Tehler.

The type specimen was collected by the first author from La Réunion, south of Saint-Denis in the Roche Écrite nature reserve, at an altitude between 1,500 and 1,680 m (4,920 and 5,510 ft).

[2] Lecanactis borbonica forms a crustose, white to pale cream thallus, which is 100–240 μm thick.

[2] Lecanactis borbonica has been documented only from its type collection in La Réunion, where it was found growing on bark.