Botrychium lunaria.
Not a great pic. But thought I'd share it. Hadn't come across this species before, which Graham (Flora and Vegetation of County Durham) describes as "rare and sparse" in the county. Found it just just east of Waskerley Station on the C2C. Lovely little fern.
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/17328521@N00/3611379489/">moonwort Botrychium lunaria</a>