Lecanora caesiosora (images of British lichens)

Thallus whitish to pale grey, areolate, with areole surfaces brown-flecked to uniformly dark brown-granular, surface sorediate, soralia initially rounded and delimited, later extensive over the thallus surface, apothecia rare; on well-lit faces of siliceous rocks, northern, locally common.

Refs: Smith et al. (2009), 478; Purvis et al. (1992), 300; Dobson (2005), 215-216 (photo); Dobson (2011), 220-1 (photo, poorly printed).

lastdragon.org

Images of British Lichens