[4] Genus Carbacanthographis bears a strong resemblance to the genera Allographa and Graphis, with which it shares several characteristics, such as Trentepohlia-like photobionts, a typically carbonised (blackened) lirelliform excipulum, and colourless, transversely septate or muriform ascospores.

This fissure's walls are covered at the tips by warty periphysoids, which are challenging to observe and rarely seen.

[4] The growth pattern of the carbonised excipulum in Carbacanthographis results in less evident striate lirellae compared to many species of Graphis and Allographa.

Clearly striate lirellae in Carbacanthographis are typically visible only when the excipulum is abraded, as seen in species like C. latispora.

In other species, there is little or no endospore formation, and the septa remain thin, with ascospores that may or may not exhibit a positive I-reaction.