There's not enough visible for me to make an identification.

Sori are often helpful in identifying ferns - that's how I knew I'd found Oreopteris limbosperma rather than an odd Dryopteris.

I'd guess that this is a male fern with more dissected pinnules than usual, but in the field I would have checked the overall shape of the frond, and the colour of the petiole scales.

thanks for the tips. Ian