D. graphidiza D. loandensis D. longissima Dimidiographa is a genus of lichen-forming fungi in the family Roccellographaceae.

Following a molecular phylogenetic-based reorganization of the order Arthoniales, lichenologists Damien Ertz and Anders Tehler circumscribed Dimidiographa in 2011, with D. loandensis assigned as the type species.

[3] The thallus of Dimidiographa is crustose and lacks a cortex, and it features a photobiont belonging to the green algal genus Trentepohlia.

The excipulum is dark brown to carbonized, reacts olivaceous with a solution of potassium hydroxide, and is broadly discontinuous below the hypothecium.

Pycnidia may be absent or present, with hyaline conidia that are slightly to strongly curved, measuring 12–28 by 0.75–1 μm.