Could this be Protoblastemia calva?

Could this be Protoblastemia calva?

Observation - Could this be Protoblastemia calva? - UK and Ireland. Description: These tiny, tan coloured, domed fruiting bodies (the measure in picture 2 is mm) are growing on the stone of a house wall that was at one time lime washed. I think this lichen is actually growing on what is left of the lime wash, but it difficult to be su

These tiny, tan coloured, domed fruiting bodies (the measure in picture 2 is mm) are growing on the stone of a house wall that was at one time lime washed. I think this lichen is actually growing on what is left of the lime wash, but it difficult to be sure, so I’m uncertain if there is a thin, greyish white thallus or not. The fruiting bodies reacted K+ crimson.

Could this be Protoblastemia calva, a picture of which I found on the Internet and which it seems to resemble? Sadly there was no description of its preferred habitat.