Background and Aims: The savannas of the Yucatán Peninsula have been studied in the last decade to know their plant diversity, structure and phytogeographical patterns of its plant components. Among the extant savannas in the south of Yucatán, one locally named Chacho Lugo has been scenario of extensive field work and its flora is well known. Recent expeditions to the site have documented new records of monocots and ferns for the Yucatán savannas. The objective of this study is to present the novelties that the site adds to the peninsular flora. Methods: During 2016 to 2019, expeditions were made to the savanna Chacho Lugo, botanical specimens were collected and deposited in the UADY herbarium. The specimens were identified using specialized literature and by comparison with herbarium material and high-resolution scanned specimens available on electronic pages. Key results: Following the identification of the specimens and the review of their distribution, Ophioglossum nudicaule and Paspalum serpentinum are registered for the first time for the savannas of the Yucatán Peninsula. Conclusions: These reports increment the diversity of Pteridophytes to 17 families, 34 genera and 67 species, and to 24 species of Paspalum in the Yucatán peninsula. ; Antecedentes y Objetivos: Las sabanas de la península de Yucatán han sido objeto de estudio en la última década para conocer su diversidad, estructura y los patrones fitogeográficos de sus componentes vegetales. Entre las sabanas existentes en el sur de Yucatán hay una localmente conocida como Chacho Lugo que ha sido escenario de trabajo de campo extenso y su flora es bien conocida. Producto de las exploraciones recientes en el sitio se han documentado nuevos registros de angiospermas y helechos para las sabanas de Yucatán. El objetivo de este estudio es dar a conocer las novedades que este sitio aporta a la flora peninsular. Métodos: Durante los años 2016 a 2019 se realizaron expediciones a la sabana Chacho Lugo, se colectaron ejemplares botánicos y se depositaron en el ...