A checklist of the bryophytes of Andorra
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A checklist of 137 liverwort and 445 moss species is established for Andorra based on a review of the literature and a long-term floristic survey. Five moss species, <i>Barbula amplexifolia</i>, <i>Ditrichum zonatum</i>, <i>Grimmia donniana</i>, <i>Pohlia bulbifera</i>, and <i>P. lutescens</i>, are new to the Iberian Peninsula. Another 7 liverwort and 156 moss species are new to Andorra. For each species, the distribution at the scale of 1 km<sup>2</sup> and altitudinal range are documented, resulting in an improved assessment of the frequency and distribution of 101 moss species previously reported from a single record. <i>Haplomitrium hookeri</i> and <i>Scapania verrucosa</i>, which are the two Regionally Extinct species of the Spanish Red List of liverworts, occur in Andorra, which hosts between 23 and 37% of the species listed as Critically Rare, Endangered, or Vulnerable in the Spanish Red List of bryophytes. Therefore, it appears that Andorra is a key area for the conservation of the high-altitude flora of the Iberian Peninsula.
