Aspicilia laevata  

Thallus continuous or slightly rimose, with few discrete areoles, smooth and even, thin, colour varying from black-green to pale green-grey, becoming grass-green when wet, usually glossy; with a black hypothallus and delimiting prothallus. Isidia and soredia absent. Photobiont chlorococcoid algae.
Anamorph: conidiomata pycnidial, conidia filiform, measuring 18-25 × ca 0.8 μm.
Teleomorph: ascomata apothecia, 0.2-0.5 mm diam., round, even, immersed and inconspicuous until wetted, numerous and usually crowded (2-5 per areole), crater-like to emergent. Thalline margin and proper margin both inconspicuous, narrow. Disc brown, flat to concave; epithecium green, N+ intensifying, without clear cells above. Interascal tissue composed of paraphyses, weakly branched, scarcely swollen at the tips. Asci clavate, thin outer coat K/I+ blue, wall and apical dome K/I–, 8-spored. Ascospores 13-20 × 9-13 μm, broadly ellipsoidal, hyaline, aseptate, thin- and smooth-walled, without a gelatinous sheath or epispore.
Chemistry: thallus K± yellow or red, Pd+ orange (stictic and ± norstictic acids, ± an unidentified terpenoid).

BLS map: click here.     Lichens maritimes: click here.   Stridvall lichens: images here.