Phlebopus marginatus has the largest fruiting body of any mushroom in Australia. It is a truly spectacular mushroom. I am including it here as it is recorded as being edible, but the sheer joy of the whole growth event may surpass any pleasure from eating it.
In Western Australia it is known as the Salmon gum bolete, and Roger Hilton has recorded it as being edible. The pictures below, however, are from Victoria (thanks lizza)
It grows in rings. These might be described as circles of giants.
The actual size of an individual mushroom can be up to a metre in diameter. This picture shows one in comparison with a block splitter that is 800 mm in length.