Aspicilia contorta ?

Aspicilia contorta ?

Observation - Aspicilia contorta ?. Description: The seemingly pruinose squamules have had me considering A. moenium, but I now think a young or not very fertile A. contorta is more likely, the black stuff being a mat of dirt, algae or cyanobacteria rather than soredia. If anyone can confirm the common

The seemingly pruinose squamules have had me considering A. moenium, but I now think a young or not very fertile A. contorta is more likely, the black stuff being a mat of dirt, algae or cyanobacteria rather than soredia. If anyone can confirm the common species, it will save me having to revisit for a sample. Thanks!

I think it was a concrete pipe.