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  • 1
    ISSN: 1615-6110
    Keywords: Hylocomiaceae ; internal transcribed region 2 ; molecular evolution ; phylogeny ; relative rate test
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nucleotide variation of the internal transcribed spacer 2 region of nuclear ribosomal DNA was used to estimate the phylogeny of the moss family Hylocomiaceae. Both parsimony and neighbour-joining analyses support the monophyly of this family, as well as all seven of the genera within the family.Rhytidium appears as the basal taxon and a North American clade comprisingRhytidiopsis andThelia is indicated. The analyses suggest thatHylocomium s. l., a polyphyletic genus, should be divided into three separate genera. The rate of nucleotide substitutions of the ITS-2 region in the Hylocomiaceae is consistent with the hypothesis of a molecular clock based on a relative rate tests. A nearly constant rate of 6.42 × 10−10 substitutions per site and per year is postulated for the family, a rate close to that of the Winteraceae and slower than that ofLopezia.
    Type of Medium: Electronic Resource
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