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Added: 3rd May 2012 Description:
Light grey crustose lichen with areolate thallus growing on wooden bench in chalk hills woodland. ‘Jam tart’ fruits, with black convex middles (some brown in a few fruit middles in lower half of image) and light grey thalline borders. Possibly Lecanora campestris (sometimes on acidic wood mentioned on ‘irishlichens’ site).
Identifications Caution: Do NOT use iSpot to identify fungi to eat!
Some fungi are very poisonous so a mistaken ID could have serious consequences.
Confidence: It might be this.
Confidence: It's likely to be this, but I can't be certain. Notes: Chemical testing is needed for identification in this group, but most likely this is L. pulicaris, with a well developed thallus. To the left, with (in this case) brighter brown apothecia, is probably L. saligna. (Note that apothecial colour, itself, does not separate these two species - see Dobson for reverse colours, though L. pulicaris is generally the darker of the two.) I would be very surprised to see L. campestris on "acid bark" - it would be more likely if bark were nutrient enriched by dust. Possibly, in Ireland, increased inorganic ions in rainfall might allow it to colonise "acid wood", but I am dubious. In any case, this is not it.
No interactions present.
Other observations of