[en] Bryophytes (Bryophyta, Marchantiophyta and Anthocerotophyta Divisions) are a functional group of terrestrial plant organisms characterized by their small size and being typical of humid and shady environments. The forests of northern Galicia, with high humidity and a temperate hyperoceanic climate, are optimal places for the development of bryophytes. La Fraga Gorda (Muras, Lugo; As Pontes, A Coruña) is part of these northern forests, and was the place chosen to carry out this work due to the lack of knowledge about the bryoflora in the area. Samples of bryophytes linked to the Rego Tras da Serra channel that runs through the interior of the forest were carried out. More specifically, three localities corresponding to the upper course, medium-high course and middle course of the Irrigation were analyzed. In addition, inventories of the vascular flora of the visited areas were carried out. A total of 50 species of bryophytes were identified; 30 mosses and 20 liverworts. The detected rates of both bryophytes and vascular plants were characterized according to their taxonomy, biogeography and ecology. Our results show that the bryoflora (also the pteridoflora) of Val do Rego Tras da Serra has mainly Macaronesian and tropical affinities, in contrast to the Angiosperm species (Magnoliopsida class), mainly Eurosiberian. From the bryophyte conservation point of view, three species of mosses and two species of "vulnerable" or "endangered" liverworts were detected. The presence of these species and their community is an argument for the conservation of this area that also presents several pteridophytic species of interest.

[gl] Os briófitos (Divisións Bryophyta, Marchantiophyta e Anthocerotophyta) son un grupo funcional de organismos vexetais terrestres caracterizados polo seu pequeno tamaño e por seren típicos de ambientes húmidos e sombríos. Os bosques setentrionais galegos, de elevada humidade ambiental e clima templado hiperoceánico, son lugares óptimos para o desenvolvemento dos briófitos. A Fraga Gorda (Muras, Lugo; As Pontes, A Coruña) forma parte destes bosques setentrionais, e foi o lugar escollido para levar a cabo este traballo polo descoñecemento existente acerca da brioflora da zona. Realizáronse mostraxes dos briófitos vencellados ó cauce do Rego Tras da Serra que circula polo interior da fraga. Máis concretamente, analizáronse tres localidades que se correspondían co curso alto, curso medio-alto e curso medio do Rego. Asemade, realizáronse inventarios da flora vascular das zonas visitadas. Identificáronse un total de 50 especies briófitas; 30 musgos e 20 hepáticas. Os taxa detectados, tanto de briófitos como de plantas vasculares foron caracterizados en base a súa taxonomía, bioxeografía e ecoloxía. Os nosos resultados amosan que a brioflora (tamén a pteridoflora) do Val do Rego Tras da Serra presenta afinidades primeiramente macaronésicas e tropicais, ao contrario do que ocorre coas especies de anxiospermas (clase Magnoliopsida), primeiramente eurosiberianas. Dende o punto de vista da conservación dos briófitos, detectáronse tres especies de musgos e dúas de hepáticas "vulnerables" ou "en perigo". A presenza destas especies e a súa comunidade constitúe un argumento a prol da conservación desta zona que tamén presenta diversas especies pteridofíticas de interese.