Diplaziopsidaceae

Diplaziopsidaceae
Scientific classification
Kingdom:	Plantae
Division:	Pteridophyta
Class:	Polypodiopsida
Order:	Polypodiales
(unranked):	Eupolypods II
Family:	Diplaziopsidaceae X.C.Zhang & Christenh. 2011
Genera
Diplaziopsis C. Chr. 1905 Homalosorus Small ex Pic. Serm. 1977

Diplaziopsidaceae is a family of ferns in the order Polypodiales, class Polypodiopsida.^[1] They are described as medium-to-large ferns, which grow near streams in forested areas. Their rhizomes are thick and decumbent to erect.^[2]

Maarten J. M. Christenhusz and Xuan-Chun Zhang originally described the family in 2011 by including the three genera Diplaziopsis C.Chr, Hemidictyum C.Presl, and Homalosorus Small ex Pic.Serm.^[2] But later that year Samuli Lehtonen showed Hemidictyum to be a sister to Aspleniaceae,^[3] so they determined that Hemidictyum should be placed in its own family, Hemidictyaceae.^[4]

Phylogenic relationships

The following diagram for the eupolypods II, based on Lehtonen, 2011,^[3] and Rothfels & al., 2012,^[5] shows a likely phylogenic relationship between the Diplaziopsidaceae and the other families of the eupolypods II clade.

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

Christenhusz & Chase (2014) recommended the transfer of all eupolypods I to Polypodiaceae and all eupolypods II to Aspleniaceae, with previous families becoming subfamilies.^[6] Accepting their reclassification, the corresponding cladogram for Aspleniaceae is:

Aspleniaceae	Cystopteridoideae Rhachidosoroideae Diplaziopsidoideae (Diplaziopsis, Homalosorus) Asplenioideae (Asplenium, Hemidictyum, Hymenasplenium) Thelypteridoideae Woodsioideae Blechnoideae Athyrioideae

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. Maarten J. M. Christenhusz; Harald Schneider (2011). "Corrections to Phytotaxa 19: Linear sequence of lycophytes and ferns" (PDF). Phytotaxa. 28: 50–52.
5. 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.
6. Maarten J.M. Christenhusz & Mark W. Chase (2014). "Trends and concepts in fern classification". Annals of Botany. 113 (9): 571–594. doi:10.1093/aob/mct299.