Browsing by Subject "Gertrudiella"

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    A molecular approach to the phylogeny of the moss genus Pseudocrossidium (Pottiaceae, Bryopsida) and its taxonomic implications
    (Wiley, 2022-08-12) Cano, María J.; Jiménez, Juan A.; Gallego, M. Teresa; Guerra, Juan; Biología Vegetal
    Pseudocrossidium is a genus of 21 species belonging to the Pottiaceae with the highest concentration of taxa and morphological variation found in South America. To investigate the evolutionary relationships among the species of Pseudocrossidium and other members of the Pottioideae, molecular phylogenetic reconstructions, using the nuclear ITS1‐5.8S‐ITS2, and the plastid atpB‐rbcL, trnG, and trnL‐F, has been performed because this genus has only been partially tested using molecular markers. Bayesian and maximum likelihood topologies show that the genus, as presently circumscribed, is polyphyletic. Consequently, the circumscription of Pseudocrossidium is amended and numerous taxonomic changes resulting from the molecular, morphological, and nomenclatural studies are proposed. The phylogenetic and morphologically divergent Pseudocrossidium mendozense is renamed as Gertrudiella mendozensis. Pseudocrossidium linearifolium and P. porphyreoneurum are representatives of the new genera Barbulastrum and Helicobarbula, respectively. Pseudocrossidium carinatum and P. santiagense are accommodated in a new genus Austrobarbula. Aloinella, nested in a paraphyletic Pseudocrossidium, is maintained at generic rank, apparently derived from Pseudocrossidium. Barbula integrifolia, B. riograndensis, and Tortula jaffuelii are transferred to Pseudocrossidium. The remaining species of Pseudocrossidium are maintained in this genus, pending further studies. Conflicts of the trees observed could be evidence of interspecific or intergeneric gene flow in various lineages in the Pottioideae.
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    A multilocus phylogeny of the moss genus Didymodon and allied genera (Pottiaceae): generic delimitations and their implications for systematics
    (Wiley, 2022-03-21) Jiménez, Juan A.; Cano, María J.; Guerra, Juan; Biología Vegetal
    Didymodon s.l. is one of the largest genera in the moss family Pottiaceae, with about 122 species distributed in all continents. This, together with its high degree of morphological variation, has made it one of the taxonomically most challenging genera of Pottiaceae. Circumscription of Didymodon s.l. has been, and still is, controversial. To date, the only molecular study that has investigated the delimitation of the genus has been far from comprehensive (35 samples from 27 species), limited in geographical scope (mainly restricted to Europe), and based exclusively on ITS sequences. To evaluate the circumscription of Didymodon s.l. and its relationships with the allied genera Andinella, Gertrudiella, and Tridontium, we conducted phylogenetic analyses of DNA sequences for three plastid markers (atpB–rbcL, trnG, and trnL‐F) and one nuclear locus (ITS) for 335 samples representing 86 species of Didymodon s.l. (ca. 70%), and all taxa of the genera Andinella, Gertrudiella, and Tridontium. Individual markers and concatenated matrices were analyzed using maximum likelihood and Bayesian approaches. Our results indicate that Didymodon s.l. is not monophyletic, because Andinella, Gertrudiella, and Tridontium species are nested within it. Species of these four genera can be divided into eight well‐supported and morphologically distinct genera: Didymodon s.s., Geheebia, Gertrudiella, Husnotiella, Trichostomopsis, Tridontium, Vinealobryum, and Zanderella. In correspondence with the results presented, 38 new combinations, 10 new synonyms, and a new name are provided for those taxa where required, and lectotypes are designated for 13 names. A diagnostic key to the eight recognized genera is provided.