Lichen or Fungi?

I do not know what species this is but we have got a lot of it in these parts. All life is precious. Anyone know what it is?

[Casablanca]

I believe it is called grey crustose lichen - you often find it on stone things such as walls or gravestones. Could be wrong though! Someone else may know better.

[Andrew-Bede Allsop]

@casablanca Thank you. :-)

[Peter H]

I think @casablanca is right. Not for the first time!