A revision of the genus Tapeinidium (C.Presl) C.Chr. in Thailand is presented based on herbarium specimens and field surveys. Two
species are recognized, namely Tapeinidium luzonicum (Hook.) K.U.Kramer and T. pinnatum (Cav.) C.Chr. A key to species, descriptions,
photographs and conservation assessments are provided. In addition, issues with the previous lectotypifications of Davallia luzonicum
Hook. and D. pinnata Cav. are resolved.