I'm pretty sure it is the Common Adder's Tongue, Ophioglossum lusitanicum, Synonyms: Ophioglossum lusitanicum subsp. coriaceum (scientific name PlantNET
http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Ophioglossum~lusitanicum)