Order: Arthoniales Family: Roccellaceae
Species: Lecanactis subabietina
Photos: On Holly. Glengarriff, Co. Cork, SW Ireland.
Thin whitish-grey thallus with abundant globose, white-pruinose, black pycnidia, often with extruded yellowish conidial mass. Apothecia unknown.
Found on the dry, shaded side of trunks and bases of old Oaks and other acid-barked trees. Also found on thick Ivy stems.
Similar: Lecanactis abietina, pruina C+ red,
Opegrapha vermicellifera, all chemical reactions negative
Lecanactis subabietina . May 2012