Gyalidea goughensis is a species of crustose lichen in the family Gomphillaceae.

Found in the Tristan da Cunha–Gough Island, it was described as a new species in 2010 by Norwegian lichenologist Dag Øvstedal.

Here it was found growing on the stem of an Island Cape myrtle (Phylica arborea) tree at an altitude of 100 m (330 ft).

[1] The lichen has a thin, green-grey crust-like thallus that grows in bark fissures.

No secondary chemicals were detected using thin-layer chromatography.