A Pteridophyta preliminary survey was carried out at Rio Doce State Park, being identified 15 families, 27 genera, and 57 species. The following families were found: Aspleniaceae, Blechnaceae, Dennstaedtiaceae, Dryopteridaceae, Gleicheniaceae, Hymenophyllaceae, Lomariopsidaceae, Osmundaceae, Polypodiaceae, Pteridaceae, Schizaeaceae, Selaginellaceae, Tectariaceae, Thelypteridaceae, and Woodsiaceae. Among them, the most representatives were Pteridaceae, with 29.8% of the collected species, distributed in four genera (Adiantum, Hemionitis, Pityrogramma, and Pteris) and Thelypteridaceae with 17.5% of the species included into two genera (Macrothelypteris and Thelypteris). The remaining families ranged from 1.8 to 8.8% of the species. Out of 57 registered species in the Park. 22 showed a restricted distribution; on the other hand Pteridaceae and Thelypteridaceae were the ones with a broader occurrence. Physical and chemical soil analysis of the Park's paths presented acid pH (4.3-5.1), variable clay proportion and médium to low P, Ca, Al and Mg content.
Pteridophyta; Rio Doce State Park (MG); pteridophytic flora