Revised name: Lepra amara
A crustose species with a thin to thick grey thallus that is sprinkled with discrete, punctiform soralia that contain white, coarsely farinose soredia. The very bitter aftertaste of the soredia is diagnostic.
Medulla and soralia: C-, K-, UV-
Pertusaria amara is common on a wide range of broadleaved trees throughout Scotland. BLS distribution map
Pertusaria amara is distinguished from Pertusaria albescens on basis of its bitter aftertaste.
scottishlichens.co.uk 