Galapagos Species Database

Thallus thick, continuous, becoming rimose to rimose-areolate, whitish gray, becoming ivory beige to ochraceous with storage; surface smooth, epruinose, corticate. Apothecia immersed, lirellate; lirellae elongate, simple to sparsely branched, rarely stellate, labia distinct, but mostly covered by the thallus which towards the disc merges with a whitish, mealy “pruina” of smooth periphysoid hyphae; disc concealed, a thin slit, expanding with age; exciple initially laterally carbonized, but becoming completely carbonized with age and then extending below the hymenium; hymenium hyaline, clear (not inspersed), I– (rarely faintly bluish laterally along the exciple); ascospores hyaline, I–, 8 per ascus, short, oblong ellipsoid to fusiform, 20-25(-28) x 8-9(-11) µm, transversely septate, 3(-6) celled. CHEMISTRY: Norstictic, K+ orange-red (forming needle shaped crystals), P+ yellow orange.

Molecular studies by Lücking et al. 2013 show that the saxicolous species previously referred to Carbacanthographis (Lücking & Bungartz 2009) belong into the new genus Redonographa in the new subfamily of Graphidaceae, the Redonographoideae.