The microsoroid ferns (Polypodiaceae)

Three genera are recognised, Leptochilus, Microsorum, and Podosorus. Lepisorus probably also belongs here, but is left out because this work started as a precursor for Flora Malesiana, and most Lepisorus species occur outside the Malesian area. The following genera, recognised by Bosman (1991), are reduced: Colysis (to Leptochilus), Neocheiropteris and Phymatosorus (to Microsorum). Many new combinations have been made. Microsorum hainanense is newly described and an evaluation is given of the main characters important for recognising species, viz. the venation and the arrangement of the sori.