seen growing on mature English Oak.
No interactions present.
I would prefer to go for the genus here as you have two very similar species down there (vulgare and interjectum), and another not too far away (cambricum). And there are hybrids! Definitely Polypodium, though.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 50.53625, -4.41382
OS grid ref: SX290735