Abstract
We present a survey of the six known species of Arthotheliumoccurring in the western Mediterranean. The oceanic A. lirellans, which may occur in the study area, is included for comparison; A. taediosoidesis described as new and a key to all species is given. Arthotheliumas understood today is composed of more-or-less distinct natural groups of species, some of them being compared here. Representatives of the A. sardoumgroup are related to species of the Arthonia radiataor A. galactitesgroup on the basis of anatomical characters of the ascomata.
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