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''Collybia cookei'' is a species of fungus in the Tricholomataceae family, and one of three species in the genus ''Collybia''. It is known from Europe, Asia, and North America. The fungus produces fruit bodies that usually grow on the decomposing remains of other mushrooms, like ''Meripilus giganteus'', ''Inonotus hispidus'', or species of ''Russula''; occasionally fruit bodies are found on rich humus or well-decayed wood. The fungus produces small white mushrooms with caps up to in diameter, supported by thin stems that originate from a yellowish-brown sclerotium. The mushroom is difficult to distinguish from the other two species of ''Collybia'' unless an effort is made to examine the sclerotia, which is usually buried in the substrate. The edibility of the mushroom has not been determined. ==Taxonomy and phylogeny== |2=''Clitocybe dealbata'' }} |2= }} }} | caption=Phylogeny and relationships of ''C. cookei'' and closely related fungi based on ribosomal DNA sequences.〔 }} The species was first described in the scientific literature in 1928 as ''Collybia cirrhata'' var. ''cookei'' by the Italian mycologist Giacomo Bresadola.〔 In a 1935 publication, Jean D. Arnold reported a series of cultural studies with monokaryon isolates (hypha having only a single haploid nucleus) of several ''Collybia'' species to determine their mating type. All attempts to produce hybrids between ''C. cirrhata'' var. ''cookei'' and ''C. cirrata'' or mycelial fusions between the two species failed. This sexual incompatibility indicated that the two taxa were separate species, and she raised the taxon from varietal to specific status, calling it ''Collybia cookei''.〔 The species has also been called ''Microcollybia cookei'' in a 1979 publication by Joanne Lennox,〔 but the genus ''Microcollybia'' has since been folded into ''Collybia''.〔 Marcel Bon and Régis Courtecuisse considered the species a variety of ''Collybia tuberosa'' in a 1988 publication.〔 A 2001 molecular analysis based on the ribosomal DNA sequences confirmed that ''C. cookei'' is phylogenetically related to ''C. tuberosa'' and ''C. cirrhata'', and that the three species form a monophyletic group that comprise the genus ''Collybia''.〔 The specific epithet ''cookei'' honors the British mycologist Mordecai Cubitt Cooke.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Collybia cookei」の詳細全文を読む スポンサード リンク
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