Racoplaca melanobapha

The species was first described in 1874 from a specimen collected in Borneo, though its taxonomic placement remained uncertain for many decades until it was transferred to the genus Strigula in 1952 and later to Racoplaca in 2020. It forms very thin, dark greyish-green patches on leaf surfaces, with narrow branching lobes outlined by fine black lines and scattered with tiny black dots. Molecular studies suggest that what has traditionally been treated as a single widespread tropical species may actually represent several closely related species that are difficult to distinguish by appearance alone.