Liken' the Lichen

Best viewed large for better detail!

My lichen knowledge is poor, although I do know these are common lichen on gravestones & that the lichen is growing on 'basic stone' not 'acid stone' so the vivid orange rusty coloured stuff could either be Caloplaca aurantia or Caloplaca citrina or Caloplaca flavescens or Caloplaca flavescens - least it's a Caloplaca of some kind anyhow! The lime green/yellow lichen could be Candelariella medians - there, there's a lichen lesson for you all to decipher, if anyone knows of the exact lichen species I'd be very grateful indeed! :)