This is the very common (especially on urban walls), "Wall screw moss". Its scientific name is Tortula muralis - and it doesn't take a graduate in classical languages to realise that quite literally means : Winding/twisted of walls.
Very apt name for this bryophyte - this is the moss you are (by far the) most likely to see on brickwork around urban areas - with stems growing from a plump, moist cushion.
I found this moss on the office wall a few days ago, and snapped it last night.
Click (as always) to enlarge the image.
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