Phytologia 28: 485 (1974).

Basionym: Lichen conspersus Ehrh. ex Ach., Lich. suec. prodr. (Linköping): 118 (1799) [1798].

Type: United Kingdom, England, Leicestershire, Bardon Hill, Leighton: Lichenes Brittanici Exsiccati 78 (UPS - lectotype).

Thallus: foliose, adnate to loosely adnate, rarely on bark or lignum, often rather brittle, 4-12 cm broad, dull yellowish green; lobes subirregular, 1-3 mm wide, contiguous to imbricate, black rimmed with age, sometimes densely liciniate with age at the center; upper surface continuous, emaculate, shiny, moderately to densely isidiate, the isidia initially in part globose but cylindrical at maturity, 0,06- 0,2 mm in diameter, to 1mm high, black tipped, simple or becoming densely coralloid branched; medulla white; lower surface plane, black, shiny, sparsely to moderately rhizinate, the rhizines black, rather coarse, simple to furcate, 0,5- 1mm long. Apothecia rather rare, substipitate, the rim isidiate, 2-8 mm in diameter; spores 5-6 x 9-10 µm. Pycnidia rare, conidia bifusiform, 0.5 x 6-8 µm.

Chemistry: Stictic acid, norstictic acid, cryptostictic acid, constictic acid, connorstictic acid, menegazziac acid (trace), hyposalazinic acid (+/- trace) and usnic acid (Culberson et al. 1981: xx). Usnic acid, stictic acid (Amo de Paz et al. 2010: 166).

Ecology: On siliceous rock, rarely on bark or lignum.

Molecular data: Genbank

Distribution: Database