Distribution: C - Sar (Nascimbene & al. 2021). S - Si (Craighero 2010, Craighero & Tretiach 2010).
Description: Thallus crustose, episubstratic, yellowish or ochraceous, rimose-areolate, mostly smooth, sorediate. Soralia eroded to erumpent, 0.3-0.5 mm across, sometimes confluent and covering almost the whole thallus. Apothecia not observed in Italian material. Photobiont chlorococcoid. Spot tests: thallus K+ yellow turning red, C- KC+ fleeting violet (reaction best observed on a microscopic slide), P+ yellow. Chemistry: norstictic and picrolichenic acids;
Note: a Mediterranean-Macaronesian species, for Italy hitherto known only from the island of Linosa, which hosts an interesting group of vascular plants with Macaronesian affinities.
Growth form: Crustose
Photobiont: green algae other than Trentepohlia
Reproductive strategy: mainly asexual, by soredia, or soredia-like structures (e.g. blastidia)