As I said above, some Galerinas have the same kind of toxins as the deadly Amanitas . There is no magic way to tell if a fungus is poisonous. Not all dangerous fungi taste unpleasant, almost none of them will stain a silver spoon black, only one or two change colour when the flesh is bruised. The only certain way to know if it is poisonous is to identify it. But so little of Australia's mycoflora has been collected and identified that the chances are good that you could easily be the discoverer of an even more deadly mushroom than the Death Cap.
Many Australian species look superficially like popular edible European species.
This has resulted in more than a few hospital admissions. Aboriginal knowledge and use of fungi. Mechanisms of macrofungal poisoning in humans. The Northern Tribes of Central Australia . A naturalist's guide .