A new species of Asplenium L. (Aspleniaceae) is described and illustrated. Asplenium badinii Sylvestre & P. G. Windisch is an endemic species of the isolated forest clumps (capões) from Itacolomi State Park, from Minas Gerais, Brazil, in areas dominated by open rocky sites (campos rupestres). This environment is known for its high level of generic and specific endemism. The new species belongs to the A. salicifolium L. species group, with apical pinnae similar to lateral ones, smooth blades, and spores with echinate perispore. It is related to A. juglandifolium Lamark and A. bradeanum Handro. Diagnostic characters for A. badinii are the long basal segment on the acroscopic side of the proximal pinnae as well as the linear to linear-lanceolate scales on the stem.