Abstract: The genus Lindsaea Dryand. from the Hainan Island, China, is taxonomically revised based on extensive field observations, herbarium studies and SEM photographs of spore samples. Eleven species and one variety of the genus Lindsaea are recognized, of which L. chingii C. Chr. is a new record to the Hainan Island. L. chienii Ching and L. orbiculata (Lam.) Mett. ex Kuhn are known to have wide range of morphological variation. L. annamensis K. U. Kramer and L. fengkaiensis B. S. Wang & S. H. Shi are reduced to synonyms of L. chienii, while L. hainanensis Ching and L. orbiculata var. commixta (Tagawa) K. U. Kramer are treated as new synonyms of L. orbiculata. A brief taxonomic history of Lindsaea in Hainan and in China, a key to species of Hainan Lindsaea, habitat and distribution data for each taxon are given.

Key words: Lindsaea Dryand., new synonymy, new record, taxonomy, Hainan