The results presented in this thesis show moderate to strong support for the paraphyly of genera in Davalliaceae, especially in Peninsular Malaysia. The results were incongruent with the latest classification based on morphology but congruent with a preliminary study based on molecular data. the phylogeny showed that Leucostegia should not be in Davalliaceae. Six clades were recognised in Davalliaceae, namely the Ariaostegia clade (AC); Davallia with four clades: denticulate clade (DC1), dimorpha-divaricata clade (DCII), scyphularia-solida clade (DCIII), trichomanoides clade (DCIV); and the Humata clade (HC). Maximum parsimony and Bayesian analyses of rps4-trnS and combined three regions produced congruent topologies, but the topologies of rbcL and trnL-F produced only slight differences. The combined rbcL data also showed that all species were fully resolved without having a separated/regional clade. In general the molecular phylogenetic reconstruction of Davalliaceae based on trnL-F and rps4-trnS regions showed additional support that no genera in this family are monophyletic. However, the results produced could have been interpreted with more confidence if species from Davallodes (not reported in Peninsular Malaysia) and species from other parts of the world were included in the study. Most genera of Davalliaceae in the study area were characterized by having a single base chromosome number, x = 40, except for Leucostegia which has x = 41. All plants studied were diploids except for Humata vestita which was polyploid (hexaploid). Spores of Davallioid ferns are monolete (ellipsoid) and have verruculate ornamentation. Davalliaceae in Peninsular Malaysia comprises fifteen species in two genera, Araiostegia (1 species) and Davallia (14 species).