The species Caloplaca nigra was formally described and catalogued by lichenologists Frank Bungartz and Ulrik Søchting.

Microscopic examinations of Caloplaca nigra reveal a brownish-olive epihymenium and a hymenium that is clear and free from any dispersion.

However, C. floridana is corticolous, growing on tree bark, and displays distinct thallus characteristics and chemical reactions that differentiate it from Caloplaca nigra.

Although DNA extraction for Caloplaca nigra proved challenging, its unique attributes underscore its classification as a separate species.

[2] Endemic to the Galápagos Islands, Caloplaca nigra has been observed growing on rocks in environments ranging from sun-drenched coastal regions to the lower transition zones.