Order: Incertae sedis       Family: Umbilicariaceae Species: Lasallia pustulata Growth type foliose. 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