Thallus
Fruticose, usually large (up to 30 cm), strappy (up to 3 cm)
Color
Grey-green to dark brown (particularly in sunny sites)
Reproduction
Apothecia: frequent, with a concave disc of the same color as the thallus, located on the edges of the strips
Soralia: —
Isidia: —
Habitat
Heliophilous, found in well-ventilated sites
Sensitivity to air pollution
Very sensitive to acid pollution and eutrophication