Flavoplaca oasis

Found on limestone, including embedded stones, concrete and is frequently encountered overgrowing Bagliettoa parmigera s. lat. along the south Gower coast. The thin thallus is yellowish with abundant small (0.2-0.4mm) orange-yellow apothecia, which have very narrow margins. Apothecia K+ purple. Locally recorded associates include Arthonia calcarea, Bagliettoa parmigera s. lat. and Variospora flavescens. 

Not listed by Alan Orange in Flora of Glamorgan (Wade et al, 1994). Formerly included under Athalia (Caloplaca) holocarpa s.lat.