TYPE. GUADELOUPE. “Supra corticem Coffeae arabicae ad Parnassum 600-700 m.s.m.” (Vainio 1899); P. Duss 515 (TUR-Vain. 27368).

Description. Life form: lichenized fungus.

Thallus crustose, whitish to whitish gray, continuous, smooth to wrinkled, dull to slightly glossy; vegetative diaspores absent. Photobiont trenteophlioid alga. Ascomata lirellae, erumpent with a +/- thick lateral thalline margin, short, straight or slightly curved, unbranched, 1.0 x 0.5 mm; labia convergent, entire, black, not pruinose; disk concealed (dussii-morph). Exciple laterally carbonized, often with crystals embedded laterally; epithecium brown; hymenium clear, 130-160 μm high; paraphyses 1.5 μm thick, tips pigmented brown, rarely branched. Asci 8-spored; ascospores hyaline becoming brownish, transversely 15-23-septate, 70–105 × 8–10 μm.

Chemistry. Norstictic acid; spores I+ blue.

Substrate and Habitat. Corticolous on hardwood trees.

Distribution. Southeast Asia, Neotropics north into eastern North America; in North Carolina found in Coastal Plain ecoregion.

Literature

Kalb, J., R. Lücking & K. Kalb. (2018) The lichen genera Allographa and Graphis (Ascomycota: Ostropales, Graphidaceae) in Thailand – eleven new species, forty-seven new records and a key to all one hundred and fifteen species so far recorded for the country. Phytotaxa 377(1): 1-83.

Staiger B. (2002) Die Flechtenfamilie Graphidaceae. Studien in Richtung einer natürlicheren Gliederung. Bibliotheca Lichenologica 85: 1–526.

Vainio, E.A. 1899. Lichenes novi rarioresque, ser. III. Beiblatt zur Hedwigia 38:(253)-(259) (original description).