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Adiantaceae (as construed here, ''sensu strictu'', not a synonym of Pteridaceae) is a family of ferns in the order Pteridales. This includes the family formerly known as the "Vittariaceae." Recent genetic analyses based on chloroplast genes demonstrate that the vittarioid ferns cladistically nest within the genus ''Adiantum'', making that genus paraphyletic. The vittarioid ferns are primarily epiphytic in tropical regions and all have simple leaves with sori that follow the veins and lack true indusia; the sori are most often marginal with a false indusium formed from the reflexed leaf margin. The family also includes a species, ''Vittaria appalachiana'', that is highly unusual in that the sporophyte stage of the life cycle is absent. This species consists solely of photosynthetic gametophytes that reproduce asexually. The ferns historically considered as ''Adiantum'' include both petrophilic and terrestrial plants. Most of the species in this genus do compose a clade within the family, but apparently ''Adiantum raddianum'' and possibly some related species constitute a clade that is sister to the vittarioids combined with the rest of the genus ''Adiantum''. This family is most closely allied with the Pellaeaceae within the Pteridales. Based on phylogenetic research, Smith ''et al.'' (2006)〔(Smith ''et al.'' (2006) A classification for extant ferns ) Taxon 55(3): 705–731 (Aug 2006)〕 included Adiantaceae as part of the family Pteridaceae and Christenhusz ''et al.'' (2011) listed its genera in Vittarioideae , one of five subfamilies of Pteridaceae. ==Sources== * Schuettpelz, Eric, Harald Schneider, Layne Huiet, Michael D. Windham, Kathleen M. Pryer. "A molecular phylogeny of the fern family Pteridaceae: Assessing overall relationships and the affinities of previously unsampled genera." Molecular Phylogenetics and Evolution, 44: 1172–1185. 2007: http://www.pryerlab.net/publication/fichier1047.pdf *Lindsay, Stuart (2003) (Considerations for a revision of the fern family Vittariaceae for Flora Malesiana ). ''Telopea'' 10(1) : 99-112. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Adiantaceae」の詳細全文を読む スポンサード リンク
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