Browsing by Subject "Didymodon"

Now showing 1 - 3 of 3
  • Thumbnail Image
    Publication
    Restricted
    A multilocus phylogeny of the moss genus Didymodon and allied genera (Pottiaceae): generic delimitations and their implications for systematics
    (Wiley, 2022-03-21) Cano Bernabé, María Jesús; Guerra Montes, Juan; Jiménez Fernández, Juan Antonio; 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.
  • Thumbnail Image
    Publication
    Restricted
    Didymodon buckii (Pottiaceae), a new moss species from the Neotropics
    (BioOne Digital Library, 2018-11-16) Alonso García, Marta; Cano Bernabé, María Jesús; Jiménez Fernández, Juan Antonio; Biología Vegetal
    Didymodon buckii J.A.Jiménez & M.J.Cano is described as a new species from central Peru and northwestern Argentina. It is readily distinguished from all congeners by having bistratose to tetrastratose leaf margins from the apex to near the base and long-cylindric, thickened and deciduous leaf apices that are strongly channeled ventrally. Additionally, the new moss is characterized by its linear-oblong leaves, papillose distal laminal cells, and costa with a hyaline area of rectangular cells on the distal ventral surface and with ventral stereids below midleaf. Drawings and light microscope photographs of the main characters are given, and possible confusion with other closely related taxa is discussed. Distribution of the new species is mapped.
  • Thumbnail Image
    Publication
    Embargo
    Didymodon edentulus (Bryophyta, Pottiaceae), a new Andean species from the Cordillera Occidental in Peru
    (Schweizerbart Science Publishers, 2015-05-01) Alonso García, Marta; Cano Bernabé, María Jesús; Guerra Montes, Juan; Jiménez Fernández, Juan Antonio; Biología Vegetal
    Didymodon edentulus J.A. Jiménez & M.J. Cano, is described and illustrated as a new Andean species from the Cordillera Occidental in north-central Peruvian departments of Ancash, La Libertad and Lima. It is characterized mainly by its appressed leaves when dry, plane margins above midleaf, smooth laminal cells, oblate and transversely thick-walled marginal basal cells, differentiated perichaetial leaves and gymnostomous capsules. Its distinction from, and relationships with some closely related species within the genus are discussed.