I liked your blog of walk to Beauchamps Falls in the Otways, but noticed you wrote about “umbrella ferns”. These are called TREE ferns in Australia, there are only 2 types, Dicksonia & Cyathea.
Remnant vegetation from when Australia was joined as part of Gondwana – very slow growing. About an inch per year, so those in your photo are very old by the standards of Europeans in Australia.
Hope this is useful to you, all the best,