Order: Lecanorales Family: Incertae sedis
Species: Lecania rabenhorstii
Photos: Coastal wall. Ballyrisode, Co. Cork, SW Ireland.
Identified by John Douglass
Thallus forms thick areolate, yellowish-grey, non-pruinose +/- eroded patches. Apothecia to 0.7mm with pruinose orange-brown discs, the yellow-white margins sometimes excluded. The spores are 1-septate, 11-13(-16) x 4-7 Ám. Microscope photograph below.
Chemical reactions negative.
Mainly coastal on base-rich rocks, limestone etc
Similar: L. turicensis. Thallus whitish-grey with crowded apothecia