Galapagos Species Database

Thallus thin, continuous to rimose, lead gray to whitish gray; surface smooth, not pruinose; Apothecia prominent to sessile, lirellate; lirellae broad, elongate, moderately to sparsely branched; labia thick, broad, blackened, entire, becoming striate with age (see notes), young labia almost entirely covered by thick cover of orange to reddish orange pruina, eroding with age and eventually confined to the cracks between the labia striations; disc concealed to barely expanded; exciple completely carbonized, carbonization extending below the hymenium; hymenium hyaline, clear (not inspers), I–; ascospores hyaline, I+ bluish violet, 2-6 per ascus, narrowly oblong to fusiform, 70-120 x 10-15 µm, mostly transversely septate, but terminally becoming muriform, with 18-25 transversal septa, terminal cells with 1-2 septa. Chemistry: Tretrahydroxyanthraquinone-1,3,6,8 (reddish apothecial pruina; K+ pinkish violet); no other substances found; all other spot tests negative.

Previous reports of Phaeographina (= Graphis) chrysocarpa by Weber (1993) most likely belong here, but this material was unfortunately not found in COLO (Santa Cruz, lower transition zone, above Academy Bay, Weber L-40405, L-43952). The specimens recently collected on Pinta have smaller, terminally submuriform spores and thus belong to Graphis subchrysocarpa sensu Lücking et al. (2008).