Adiantaceae

Adiantaceae
Scientific classification
Kingdom:	Plantae
Division:	Pteridophyta
Class:	Pteridopsida
Order:	Pteridales
Family:	Adiantaceae
Genera
Adiantum Vittaria Scoliosorus Ananthacorus Polytaenium Anetium Antrophyum Haplopteris Monogramma Radiovittaria Hecistopteris Rheopteris

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.

Adiantum lunulatum in Goa, India

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)^[1] included Adiantaceae as part of the family Pteridaceae and Christenhusz et al. (2011)^[2] listed its genera in Vittarioideae (C.Presl) Crabbe, Jermy & Mickel 1975, one of five subfamilies of Pteridaceae.

Sources

1. Smith et al. (2006) A classification for extant ferns Taxon 55(3): 705–731 (Aug 2006)
2. Christenhusz, Maarten J. M.; Zhang, Xian-Chun; Schneider, Harald (18 February 2011). "A linear sequence of extant families and genera of lycophytes and ferns" (PDF). Phytotaxa 19: 7–54. ISSN 1179-3163.

• 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.