From Graeme C’s ‘Yorkshire Rock Art’ site:
The Witchcraft Stone – Clach na Buidseach – Strathtay, Perthshire PSAS 1920-21 p38 – This is the name given to a large cup marked boulder built into a dry stone wall on Tullypowrie farm. No tradition was noted regarding how the stone came by this name, although local opinion was that the stone was a cresset to hold lamps for monks attending midnight services.