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Added: 1st June 2012 Description:
Found on a wall in Cornwall last year
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's likely to be this, but I can't be certain. Notes: To those who think of C. flavescens as always forming neat, rounded colonies with distinctly lobed ('placodioid') margins, this suggestion might be a surprise. But like its close relative, C. thallincola, this neat growth form may not apply on rough-surfaced rocks. The colours are right, with a well-formed bright yellow thallus under the apothecia, and at the bottom left, there is some sign of lobe formation (and this part of the photograph is actually quite a good match to the photo of C. flavescens in the recent monograph by Ester Gaya of the Caloplaca saxicola group, which includes C. flavescens and its allies). I have thought about other possibilities but keep coming back to C. flavescens. To be sure I would want to look at the spores, but I feel reasonably confident this is what it is. A very attractive photograph of an unusual but by no means unheard of growth form.
No interactions present.
Other observations of