Ochrolechia parella - © Barry Stewart
Ochrolechia parella Crab's Eye Lichen
(L.) A. Massal.
A distinctive, grey, crustose lichen whose thallus has a distinct white border. It forms quite large patches on smooth, siliceous rocky surfaces and walls and it usually bears lots of wart-like, lecanorine apothecia. It is frequent in West Glamorgan, especially on old walls and stone buidings, e.g. in Margam Park, and is a key component of the lichen assemblage on quartz-conglomerate outcrops and boulders associated with the Brownstones Formation of western Gower.
Listed by Alan Orange in Flora of Glamorgan (Wade et al, 1994).
