Order: Agyriales Family: Agyriaceae
Species: Placopsis lambii
Photos: On upland rock. Gougane Barra and Ballingeary, SW Ireland
Shiny pinkish-white or greyish thallus with radiating marginal lobes. The variable brownish cephalodia are sometimes absent. Concentric blackish-brown or greenish soralia. Apothecia with flat pink or yellowish discs with thick margins.
Occurs on damp, siliceous, upland rocks, frequently by streams or lakes. Often associated with metal-rich sites. Thallus C+ red.
Similar: Trapelia placodioides
Placopsis lambii August and October 2009