The study of the pteridophytes of the Guiana Shield and the writing of the Flora of the Guianas led to the discovery that, taxonomically, a few combinations were not yet established for certain taxa. Accordingly, new combinations are proposed for two subspecies of Hymenophyllaceae (Didymoglossum punctatum subsp. labiatum and D. punctatum subsp. sphenoides), two varieties of Pteridaceae (Jamesonia paucifolia var. neblinae and J. paucifolia var. steyermarkii) and one species of Thelypteridaceae (Amauropelta demerarana).