Cystopteridaceae

Cystopteridaceae
Scientific classification
Kingdom:	Plantae
Division:	Pteridophyta
Class:	Polypodiopsida
Order:	Polypodiales
(unranked):	Eupolypods II
Family:	Cystopteridaceae (Payer) Schmakov
Genera
Acystopteris Nakai 1933 Cystoathyrium Ching 1966 Cystopteris Bernh. 1805 Gymnocarpium Newman 1851

Cystopteridaceae are a family of ferns in the eupolypods II clade of the order Polypodiales, class Polypodiopsida.^[1] They include four genera: Acystopteris, Cystoathyrium, Cystopteris, and Gymnocarpium. Gymnocarpium and Cystopteris have been found to be sister to the remaining Eupolypods II.^[2]

Cystopteridaceae are small or medium-sized ferns in forests and crevices.^[2] They generally have thin laminae, and small, round, naked sori.

Phylogenic relationships

The following diagram for the eupolypods II, based on Lehtonen, 2011,^[3] and Rothfels & al., 2012,^[4] shows a likely phylogenic relationship between the Cystopteridaceae and the other families of the eupolypods II clade.

eupolypods II	Cystopteridaceae Rhachidosoraceae Diplaziopsidaceae Aspleniaceae Hemidictyaceae Thelypteridaceae Woodsiaceae Onocleaceae Blechnaceae Athyriaceae

References

1. Alan R. Smith, Kathleen M. Pryer, Eric Schuettpelz, Petra Korall, Harald Schneider & Paul G. Wolf (2006). "A classification for extant ferns" (PDF). Taxon 55 (3): 705–731. doi:10.2307/25065646.
2. Maarten J. M. Christenhusz, Xian-Chun Zhang & Harald Schneider (2011). "A linear sequence of extant families and genera of lycophytes and ferns" (PDF). Phytotaxa 19: 7–54.
3. Samuli Lehtonen (2011). "Towards Resolving the Complete Fern Tree of Life" (PDF). PLoS ONE 6 (10): e24851. doi:10.1371/journal.pone.0024851. PMC 3192703. PMID 22022365.
4. Carl J. Rothfels, Anders Larsson, Li-Yaung Kuo, Petra Korall, Wen- Liang Chiou, Kathleen M. Pryer (2012). "Overcoming Deep Roots, Fast Rates, and Short Internodes to Resolve the Ancient Rapid Radiation of Eupolypod II Ferns". Systematic Biology 61 (1): 70. doi:10.1093/sysbio/sys001. PMID 22223449.