Lemmaphyllum is a genus of ferns in the family Polypodiaceae, subfamily Microsoroideae, according to the Pteridophyte Phylogeny Group classification of 2016 (PPG I).
Lemmaphyllum was first described by Carl Presl in 1851. A molecular phylogenetic study in 2019 suggested that Lemmaphyllum was one of a group of closely related genera in the subfamily Microsoroideae; a group the authors termed 'Lepisorus sensu lato'.
As of February 2020, the Checklist of Ferns and Lycophytes of the World recognized ...