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Polypodium vulgare
about 20-30 cm long leaves, I took some pictures about the habitat and the back side of the leaves
rock, Myra falls
@ monkey mind
Nice detailed series! If this was in the UK it would key out quite positively as Polypodium vulgare. http://en.wikipedia.org/wiki/Polypodium_... I don't know if there are more spp. in Austria than we have here but it's not P.cambricum or P.interjectum.