Quote:
Originally Posted by kiltoncomp  after looking at the british lichens website i was not totally sure of this one , as there are quite a few similar ones, |
Actually,
Lecanora muralis is quite easy. The centre part of the thallus is a crust, no sign of lobing, so you are dealing with a lichen that is crustose with an apparently lobed margin (technically 'placodioid'). There are several bright yellow/orange lichens of this description in the genus
Caloplaca, but you have a pale grey to beige species with brown discs (apothecia) and in lowland Britain that pretty much means
Lecanora muralis.
Lecanora is a big genus, but unless you are at high altitude or on the north Scottish coast and also VERY lucky, you are not going to see any other
Lecanora with the same placodioid margin as
L. muralis. Maybe there is something else in another genus - placodioid margins are not
that unusual - but nothing comes to mind.
Obviously I join with Jenny in supporting your ID!
Alan