| Noun | 1. | genus Pecopteris - genus of Carboniferous fossil ferns division Pteridophyta, Pteridophyta - containing all the vascular plants that do not bear seeds: ferns, horsetails, club mosses, and whisk ferns; in some classifications considered a subdivision of Tracheophyta pecopteris - Carboniferous fossil fern characterized by a regular arrangement of the leaflets resembling a comb fern genus - genera of ferns and fern allies |