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 no t yet established for certain taxa. Accordingly, new combinations are proposed for two subspecies of Hymenophyllaceae {Didymoglossum punctatum subsp. labiatum and D. punctaturn subsp. sphenoides), two varieties of Pteridaceae (Iamesonia paucifolia var. neblinae and J. paucifolia var. steycrmarkii) and one species of Thelypteridaceae (Amauropelta dernerarana).