For some remarks about Agaricus see https://canberra.naturemapr.org/species/404. Agaricus xanthodermus is a species that is stains or bruises yellow. There may be more than one such yellowing species in the ACT, hence the use of 'xanthodermus group' for such Agaricus sightings.
Agaricus 'xanthodermus group' is listed in the following regions:
Canberra & Southern Tablelands
Species page sighting lists are under redevelopment and will return very soon.