A revision of the fern family Osmundaceae in Brazil

ABSTRACT As part of floristic surveys in the Southern Cone of South America and the Flora do Brasil 2020 project, we present a revision of Osmundaceae in Brazil. Osmundaceae is represented by two genera (Osmundastrum and Osmunda) and three species. One of them, Osmunda piresii, is endemic to the savannas of Central Brazil, occurring in the states of Goiás, Minas Gerais, and Mato Grosso. Osmunda gracilis is synonymized under Osmunda spectabilis. We present a dichotomous key, descriptions, diagnostic illustrations, distributions, and notes on taxonomy and ecology.