Unidentified bryophyte

Unidentified bryophyte

Observation - Unidentified bryophyte - UK and Ireland. Description: Removed from car window seal where it had been growing happily for many months. I initially had this

Removed from car window seal where it had been growing happily for many months. I initially had this down as Bryan dichotomum but kept it in a plastic bag for a week and the filamentous ?setae appeared. So not a Bryum .. or has it gone mouldy? Also B. cappilare present in photo 3, I think.
Tried to re-ID this from guidebook but can't seem to get anywhere.