Confidence: It's likely to be this, but I can't be certain.
Notes: I have copied this into Photoshop to try to have a look without the awful blue colour cast. On balance I think it is R. reductum var cinereum (varetal name not yet validated in R. reductum). This has concentrically arranged apothecia and a somewhat rougher, silver-grey surface. Examination of spores necessary to be sure. [I have a page on this ready to go up on my site bur I am delaying while I get better photographs of 'typical' R. reductum.]