Thallus
Foliose, small tufted mats of 1–3 cm in diameter or more, which may form large colonies by association, formed of very jagged lobules like a lace look
Color
Upper side yellow (in the sun) to greenish (in the shade), underside whitish (difficult to observe)
Reproduction
Apothecia: frequent, orange disc
Soralia: —
Isidia: —
Habitat
Heliophilous and nitrophilous
Sensitivity to air pollution
Resistant to pollution