Order: Incertae sedis Family: Arthrorhaphidaceae
Species: Arthrorhaphis citrinella
Photos: On upland rock. Gougane Barra, Co. Cork, SW Ireland.
Specimen identified by John Douglass
Thallus forms small, scattered clumps of green to yellowish, fragile granules which soon become sorediate. Apothecia rare, dark green or black, pycnidia are unknown.
Found on mosses and soil in crevices on +/- vertical rock faces of siliceous upland rocks. Scattered distribution throughout Ireland.
Arthrorhaphis citrinella. Gougane Barra, Co. Cork. September 2009