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Agaricus xanthodermus
''Agaricus xanthodermus'', commonly known as the yellow-staining mushroom or simply the yellow-stainer,〔 is a mushroom of the
genus ''Agaricus'', which displays a strong yellow colouration at the base of the stem when cut. It is poisonous for most people, causing gastrointestinal upset, but can be eaten by some without apparent negative effect.
==Taxonomy==
This species was first officially defined under the name ''Agaricus xanthodermus'' in 1876 by Léon Gaston Genevier, in a letter published in the bulletin of the French Botanical Society.〔〔 Genevier described the ''Agaricus'' mushrooms commonly eaten (perhaps sometimes inadvisedly) in the region of Nantes, and attempted to clarify the distinctions between them. He proposed a detailed reclassification into 5 species, including this new one. Apparently up until that time, these yellow-staining mushrooms were considered to be just varieties of other species which are edible: ''A. arvensis'', ''(A. edulis )'', and ''A. silvicola''.〔
The epithet ''xanthodermus'' is derived from the Ancient Greek words for "yellow" and "skin", which were then given a Latin adjective ending. This is the official name, but the form ''Agaricus xanthoderma'' is also often seen.〔〔〔 In the latter name, ''-derma'' "skin" is a neuter noun which does not have to agree in gender with ''Agaricus'', and so this form is legal according to the rules of botanical nomenclature.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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