(L.) Linds.
Placopsis gelida is an uncommon lichen in Britain, probably confined to the Western Highlands of Scotland. It is almost certain that all records of this species in West Glamorgan are in fact Placopsis lambii, which is now regarded as the more common species. Neither species can be reliably distinguished from each other on morphological characters alone. The specimen photographed here was found on a large siliceous boulder near a coal mine in Blaendulais.
Listed under Placopsis gelida by Alan Orange in Flora of Glamorgan (Wade et al, 1994).
Key: