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fronds. I could not find a picture on iSpot illustrating this, but maybe I missed it. If fertile and sterile fronds look the same the fern is not B. spicant.
The shape of these are round or oval and are better than leaf shape for working it out.
Thanks! Appreciate the diagnostic features that have been provided.
Lat/Lng: 50.4151, -4.0903
OS grid ref: SX515593