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They are definitely black trumpets. I would eat them.
Looks like P. coccineus is the better name for this Australian species.
P. cinnabarinus should be the only species of Pycnoporus growing in your area. The P. cinnabarinus I've found don't have the yellow edge or the black center, so I can't offer a positive ID.
Sulphur Shelf should show a lot more orange coloration. It's probably either Berkeley's polypore or the black-staining polypore. It it stains black within an hour of handling, it's the latter.
In the US and Europe, I would call that the Cinnabar polypore (Pycnoporus cinnabarinus). Not sure if it's found in Oz though.
It's Boletus bicolor if the pores bruise blue but the flesh hardly changes color when cut. The two-colored bolete is a choice edible.
Not much information on A. purpurascens anywhere. I think that might be an obsolete term. Sometimes one has to be satisfied with getting as far as the genus from a photo.
I see brown-colored free gills. Should be Agaricus.
Roger's Mushrooms calls them inedible. http://www.rogersmushrooms.com
There appear to be scales on the caps rather than removable patches (as with Amanitas). That would make Lepiota more likely.
