Phytologia 28, 5: 479 (1974).

Basionym: Parmelia semilunata Lynge, Ark. Bot. 13(no. 13): 23 (1914).

Type: Brazil, Mato Grosso, Buriti, Serra da Chapada, G. Malme (S - lectotype).

Thallus: closely appressed, whitish mineral gray, 1,0-1,5 cm broad; lobes sublinear, 0,2-0,3 mm wide, the marginal bulbate cilia with a branched, ciliate tip; upper surface plane, smooth; lower surface black, moderately rhizinate, the rhizines branched. Apothecia numerous, adnate, about 1mm in diameter; spores 8, semi-lunate or cornute, 2-3 X 9-12 µm.

Photobiont: Data lacking.

Chemistry: Cortex and medulla negative with color tests, only skyrin present.

Ecology: On bark of trees in cerrado vegetation.

Molecular data: Genbank

Distribution: Brazil.

Note: This species is extremely close to Bulbothrix schiffneri in thallus size and lobation. It would be differentiatedby the C negative reaction in the medulla and the narrower, more semi-lunate spore outline. Neither species has been collected outside its type-locality.