Resumen: El Parque Nacional Los Mármoles, en el estado de Hidalgo, México, es una zona de interés florístico y fitogeográfico. Para proponer medidas para su conservación se debe tener un conocimiento adecuado de la biota, en particular de grupos como el de los musgos que han sido poco estudiados. Para esta investigación se recolectaron 573 muestras en los principales tipos de vegetación, que representan 129 especies y variedades de musgos. Mediante estimadores de riqueza no paramétricos (Jackknife y Bootstrap) se determinó que el inventario contiene entre el 78 y el 87% de los taxones infragenéricos esperados. La flora de musgos incluye especies como Aloina rigida y Claopodium pellucinerve que amplían su distribución conocida hacia el sur, y Campylopus anderssonii que la extiende hacia el norte. Los taxones muestran varios patrones de distribución, enunciados en orden de importancia: amplia distribución, mesoamericano, del Caribe, boreal, endémico, austral y chihuahuense. De los cuatro municipios representados en el parque, Zimapán, el de mayor extensión, también muestra la mayor riqueza de musgos (90 especies y variedades), mientras que en el de Pacula, el de menor superficie, sólo se conocen 39 taxones. Palabras clave: área natural protegida, Hidalgo, Los Mármoles, musgos.Abstract: Los Mármoles National Park, in the Mexican state of Hidalgo, is an area of floristic and phytogeographical interest. An adequate knowledge of its biota is a requisite before adopting conservation measures, especially for locally unknown plant groups such as the mosses. For this research, 573 specimens representing 129 species and varieties of mosses, were obtained from the main types of vegetation. Non-parametric richness estimators (Jackknife and Bootstrap), indicate that the local moss inventory contains between 78 and 87% of the expected infrageneric taxa. The moss flora includes such species as Aloina rigida and Claopodium pellucinerve that extend southwards their known distribution, and Campylopus anderssonii that extends it northwards. The identified patterns of distribution are arranged by number of species, as follows: Wide distribution, Mesoamerican, Caribbean, Boreal, Endemic, Southern, and Chihuahuan. Zimapán, the largest of the four municipalities represented in the park, is the most diverse with 90 moss species and varieties; in contrast, Pacula, with the smallest surface area, has the smallest moss flora, with 39 taxa.
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