A new species, (Hymenophyllaceae), and two new records with note to the genus Desv. from Thailand.

During the filmy fern (Hymenophyllaceae) diversity study in Thailand, the genus was investigated using morphological data and molecular phylogenetic analyses of the chloroplast region. This study revealed a new species, S.Chokrassameehirun, Kraichak & Jaruwatt., , which is currently known only from peninsular Thailand. This taxon resembles in possessing peltate fronds but differs in frond size, the structure of false veinlets, and the appearance of its sori. The phylogenetic results further confirmed the distinct phylogenetic positions of and , which were also newly recorded and described for Thailand.