Any sphagnum experts? Spreading branches like rat's tails, pale green colour. Shape of leaf tips looks distinctive but doesn't seem to match any in the BBS book. From boggy meadow within large floristically diverse wood in Warwickshire.
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I think this is either Sphagnum denticulatum or S. inundatum. The branches appear to have the distinctive 'cow horn' curve of the Subsecunda group, and as far as I can tell the pores in the leaves look like this group too. If you can easily distinguish the pendent branches from the spreading branches it's likely to be S. inundatum; if not, S. denticulatum. Distribution of fibrils in the stem leaves is diagnostic.
Lat/Lng: 52.366, -1.8531
OS grid ref: SP100742