The species is distinguished by its saxicolous (rock-dwelling) habitat, presence of norstictic acid, and unique ascospore characteristics.

The specific epithet halonata refers to the characteristic halonate (halo-like) ascospores found in this species.

It lacks a cortex, is dull and ochraceous white, measuring up to 0.2 mm thick, and is not surrounded by a prothallus.

[2] Chemical spot tests show that the thallus and thalline margin of the apothecia are UV−, C−, P−, and K+ (yellow turning red).

[2] Graphis halonata was found on a free-standing sandstone boulder and at the time of original publication was known only from Brazil.