Psilolechia-lucida

Psilolechia lucida is  sometime know as Sulphur Dust Lichen or 

Lemon-coloured Rock Lichen

The Lichens in Churchyards Aidgap Leaflet has a picture of Psilolechia lucida at the beginning as an example of a lichen on an acid rock

Learn your Lichens Series 1. Arthonia radiata 2. Caloplaca flavovirescens 3. Acrocordia conoidea 4. Squamarina cartilaginea 5. Xanthoria parietina 6. Lecanora gangaleoides 7. Physcia tenella 8. Lepraria incana 9. Porpidia tuberculosa 10. Psilolechia lucida 11. Lecanora soralifera  12. Opegrapha gyrocarpa

To Quote Last Dragon:

Thallus a thin to granular, powdery, yellow-green to sulphur yellow crust, in places thicker and irregularly cracked; apothecia rare, very small, yellow-green to orange. Common throughout Britain, often in somewhat shaded situations, generally on base-poor rock,

Go to Settle Parish Church churchyard, to this big box tombstone marked by the red arrow. Then go to the gravestone to the left of it 

There is a little bit of bright lemon green Psilolechia in a groove (top right) on the tombstone to the left -See below

Here seen close up:-

There is also some Psilolechia at the courtyard of Malham Tarn House