TYPE. BRAZIL. Rio de Janeiro. A.F.M. Glaziou 5531 (G, G-G-180586/1 lectotype designated by Hale 1974; BM, isolectotype).

Description. Life form: lichenized fungus.

Thallus crustose, thin, endophloedal to epiphloedal, pale greenish gray, dull, 4-8 cm diam.; vegetative diaspores absent. Photobiont Trentepohlia alga. Ascomata chroodiscoid apothecia, dispersed, erumpent, round to irregularly elongate, up to 3.0 mm wide; thalline rim thick, erect to recurved; exciple not persistent; disk flat, white-pruinose. Hymenium to ~60 μm high. Asci 8-spored; ascospores hyaline, 8-celled, 15-25 x 5-8 μm.

Chemistry. Stictic and constictic acids.

Substrate and Habitat. Corticolous on trees.

Distribution. Neotropical, north into southeastern North America; in North Carolina found in the Coastal Plain ecoregion.

Literature

Hale, M.E., Jr (1974) Morden-Smithsonian Expedition to Dominica: The lichens (Thelotremataceae). Smithsonian Contributions to Botany 16: 1-46 (description as Ocellularia dilatata).

Hale, M.E., Jr (1978) A revision of the lichen family Thelotremataceae in Panama. Smithsonian Contributions to Botany 38: 1-60 (description as Ocellularia dilatata).

Müller, J. (1895) Thelotremeae et Graphideae novae quas praesertim ex hb. Reg. Kewensi exponit. Journal of the Linnean Society. Botany. 30: 451-463 (original description as Ocellularia dilatata).

Parnmen, S., R. Lücking & H.T. Lumbsch (2012) Phylogenetic classification at generic level in the absence of distinct phylogenetic patterns of phenotypical variation: a case study in Graphidaceae (Ascomycota). PLoS One 7(12): e51392, 1.