Hi, thanks, it's definitely not a bracken fern! I'm pretty sure it's Asparagus virgatus, environmental weed in the ACT, which is why I posted it. I guess I should notify the ACT Parks people.
The leaves look quite folded like in Eleusine tristachya and Chloris truncata. I have suggested Eleusine as it tends to be a darker green and more rubbery than Chloris.