Unifentifed Fern Marshfield, Wilsthire

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Hi – could you identify the fern shown in the three attached images. I saw it yesterday, growing amongst Hart’s Tongues and light bramble in a shaded area of a young woodland (mostly Hawthorn) on sloping ground in fairly deep (450mm at least), moist (not wet) soil – Fuller’s Earth type geology with limestone underlying. The Fern was about 250 – 300mm tall. The area is not readily accessible to the public.

Thanks