Large moss, with very long narrow leaves up to 1.5cm, which are curved to one side.  The leaves have a long toothed tip, and the nerve is also toothed on the back, but there are no raised lines of cells as with D scoparium.  

Dicranum scoparium is very similar in the field, but with much shorter leaves.  

Your photo should show the length of the leaf

acid soils, in woodland or more open ground

Uncommon

See the British Bryological Society's webpage for this species https://www.britishbryologicalsociety.org.uk/learning/species-finder/dicranum-majus/