A new species and a new hybrid in the genus Stenogrammitis are here described, and descriptions, illustrations, and comments on the most similar species are provided. Stenogrammitis brevipubens is characterized by having hemidimorphic laminae, with the fertile portion narrower and less dissected than the sterile portion, and by its indument, which is composed of simple, hyaline, and 2-celled hairs that are appressed upon the petiole, rachis, and laminar tissue. The hybrid, Stenogrammitis ×guatemalensis, has hemidimorphic laminae and reddish, 1-furcate and 3-celled hairs that are spreading on the petiole and lamina. Based on the hybrid morphology, the putative parents are S. prionodes and S. limula.