According to the specialists in the
Genus Lepiota there seem to be several hidden species in the
rubrotinctoides complex. According to Index Fungorum this taxon
still hasn't been formally transferred to Leucoagaricus and
remains as Lepiota rubrotinctoides. Until we
have more clarity on the matter, I assume that we do not see the original
Leucoagaricus rubrotinctus in the Western USA.
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