White/grey crustose lichen with brown fruiting bodies. Margins same colour as lichen surface.
Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
No interactions present.
Thank you for the revised identification. I am a complete lichen novice so I am happy that I at least got the genus right.
Do you know of a key that will help me with lichen on stone?
Thanks in advance.
I don't know of any online keys to UK lichens on rocks (the so-called saxicolous species). Frank Dobson's excellent field guide, now in its 6th edition, has keys for the major genera, including Lecanora. Identification of many species requires chemical spot tests, and some need looking at under a microscope.
The English translation of Volkmar Wirth's Die Flechten (The Lichens) is available at the link below, and should give you a feel for the level of detail that some keys require:
Also, Jenny has kindly summarised some very useful resources here:
Lat/Lng: 51.4404, -2.0395
OS grid ref: ST973712
On a stone fence post bordering a lane and field.