Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
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Have you seen the draft keys iSpot is trying? There are three for lichens on trees. The Key Tab is on the iSpot home page.
There is also "A key to common lichens on trees in England" which can be found at http://www.keytonature.org.uk/
Good photos and descriptions of Lecanora albella, L. chlarotera and Lecanora carpinea can be seen at
Thanks for those links, I will definitely take a look!
Lat/Lng: 56.0, -4.9
OS grid ref: NS2489