The species Opegrapha ramisorediata was formally described in 2017 by lichenologists André Aptroot and Marcela Cáceres, who discovered it growing on tree bark in the Ecotel garden in Fazendinha (municipality of Macapá, state of Amapá).

The species name ramisorediata was chosen due to the branched structure of the soredia, a form of asexual reproduction in lichens.

[2] The medulla, or the layer beneath the upper cortex of the thallus, does not have a distinct colour nor does it contain calcium oxalate crystals.

The hyphae (filamentous structures of fungi) are approximately 2–3 μm wide, hyaline, and densely encrusted with similar crystals.

[2] The thallus of Opegrapha ramisorediata does not react to ultraviolet light (UV−) and, in terms of standard chemical spot tests, does not change colour with the application of P or K, but is C+ (red).