Resumen: Se registran 23 especies de musgos nuevos para la fl ora de los estados de Querétaro y San Luis Potosí, de distribución tanto restringida como amplia. Destacan Cyclodictyon richardsii y Pylaisiadelpha sharpii por ser plantas inconspicuas y endémi-cas al país, además de Donnellia commutata, conocida para México, pero sin material mexicano en los herbarios nacionales. Se discuten las características taxonómicas distintivas de las especies, su hábitat y distribución. Palabras clave: biodiversidad, epífi tas, Querétaro, San Luis Potosí, Sierra Gorda.Abstract: Twenty-three new records for moss species are reported from the states of Querétaro and San Luis Potosí, some with wide geographic ranges but others with restricted ranges. Among the restricted species, Cyclodictyon richardsii and Pylaisiadelpha sharpii are inconspicuous and endemic to Mexico. Donnellia commutata is known from Mexico but vouchers are lacking in national collections. Taxonomic characteristics, distribution and habitat of the new records are discussed.
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