Rhachidosorus

Rhachidosorus is a genus of ferns in the order Polypodiales.[2] It is the only genus in the family Rhachidosoraceae in the Pteridophyte Phylogeny Group classification of 2016 (PPG I).[3] Alternatively, the genus may be placed in the subfamily Rhachidosoroideae of a more broadly defined family Aspleniaceae,[1] the family placement used in Plants of the World Online as of November 2019.[4]

Rhachidosorus
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Rhachidosoraceae
X.C.Zhang
Genus: Rhachidosorus
Ching
Species

See text

Synonyms[1]
  • Rhachidosoroideae M.L.Wang & Y.T.Hsieh

Species

The genus was described by Ren Chang Ching in 1964, with about 7 species in eastern and southeastern Asia, including Japan, the Philippines, and Sumatra.[5] As of November 2019, Plants of the World Online accepted the following species:[4]

  • Rhachidosorus blotianus Ching – China, Vietnam
  • Rhachidosorus chrysocarpus (Alderw.) Ching
  • Rhachidosorus consimilis Ching – China (Guizhou, Sichuan, Yunnan)
  • Rhachidosorus mesosorus (Makino) Ching – China, Japan, South Korea
  • Rhachidosorus pulcher (Tagawa) Ching – Taiwan, Yunnan
  • Rhachidosorus siamensis S.Linds.
  • Rhachidosorus stramineus (Copel.) Ching
  • Rhachidosorus truncatus Ching – China (Guangxi, Guizhou, Yunnan)

Phylogenic relationships

The following diagram for the eupolypods II, based on Lehtonen, 2011,[6] and Rothfels & al., 2012,[7] shows a likely phylogenic relationship between the Rhachidosoraceae and the other families of the eupolypods II clade.

Aspleniineae (eupolypods II)
 

Cystopteridaceae

 
 
 
 

Rhachidosoraceae

 
 
 

Diplaziopsidaceae

 
 
 

Aspleniaceae

 
 

Hemidictyaceae

 
 
 
 
 
 

Thelypteridaceae

 
 
 

Woodsiaceae

 
 
 
 

Onocleaceae

 
 

Blechnaceae

 
 
 

Athyriaceae

 
 
 
 
 
 
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References
  1. Christenhusz, Maarten J.M. & Chase, Mark W. (2014). "Trends and concepts in fern classification". Annals of Botany. 113 (9): 571–594. doi:10.1093/aob/mct299. PMC 3936591. PMID 24532607.
  2. 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.CS1 maint: multiple names: authors list (link)
  3. PPG I (2016). "A community-derived classification for extant lycophytes and ferns". Journal of Systematics and Evolution. 54 (6): 563–603. doi:10.1111/jse.12229.
  4. "Rhachidosorus Ching". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-11-27.
  5. 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.
  6. 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.
  7. 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.


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