Order: Teloschistales Family: Teloschistaceae
Species: Caloplaca lactea
UK photographs. Identified by Brian Coppins
Thin white or inconconspicuous thallus without a distinct prothallus. Apothecia are plane or concave when young, sometimes leaving shallow pits in substrate. Discs bright orange-yellow becoming paler and translucent when wet. Margins are swollen and sometimes elevated. Spores with narrow septum.
Thallus K-, apothecia K+ red-purple.
Pioneer species on dry limestone fragments, also found on sea shells and pebbles. Infrequently recorded in Ireland, most records are from the Burren, Co. Clare.
Caloplaca lactea February 2010