Order: Incertae sedis Family: Umbilicariaceae
Species: Lasallia pustulata
Photos: On coastal rocks. Rock Island, Cork, SW Ireland.
Thallus greyish-beige, +/- white-pruinose when dry, greenish-brown when wet. Upper surface with numerous conspicuous oval pustules. Margins +/- lacerated. Black coralloid isidia. Apothecia very rare.
Can form large colonies on nutrient-rich, acidic, coastal or upland rocks. Most frequent in the extreme SW of Ireland.
Medulla: K-, C+ red, KC+ red, P-, UV-
Lasallia pustulata. Co. Cork, June 2009