Although very distinctive in appearance , the fly agaric have been mistaken for other yellow to red mushroom species in the Americas , such as Armillaria cf. mellea and the edible Amanita basii — a Mexican species similar to A. caesarea of Europe . Poison control centres in the U.S. and Canada have become aware that amarill ( Spanish for ' yellow ' ) is a common name for the A. caesarea @-@ like species in Mexico . Amanita caesarea can be distinguished by its entirely orange to red cap which lack the numerous white warty spots of the fly agaric . Furthermore , the stem , gills and ring of A. caesarea are bright yellow , not white . The volva is a distinct white bag , not broken into scales . In Australia , the introduced fly agaric may be confused with the native vermilion grisette ( Amanita xanthocephala ) , which grow in association with eucalypts . The latter species generally lack the white warts of A. muscaria and bear no ring .