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

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. As of November 2019[update], Plants of the World Online accepted the following species:

  • 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)

Phylogeny

External phylogeny from Lehtonen 2011 and Rothfels & al. 2012Internal phylogeny of Rhachidosorus
Aspleniineae Cystopteridaceae Rhachidosoraceae Diplaziopsidaceae Aspleniaceae Hemidictyaceae Thelypteridaceae Woodsiaceae Onocleaceae Blechnaceae Athyriaceae (eupolypods II)Rhachidosorus R. mesosorus (Makino) Ching R. blotianus Ching R. consimilis Ching R. pulcher (Tagawa) Ching
AspleniineaeCystopteridaceae Rhachidosoraceae Diplaziopsidaceae Aspleniaceae Hemidictyaceae Thelypteridaceae Woodsiaceae Onocleaceae Blechnaceae Athyriaceae
Cystopteridaceae
Rhachidosoraceae Diplaziopsidaceae Aspleniaceae Hemidictyaceae Thelypteridaceae Woodsiaceae Onocleaceae Blechnaceae Athyriaceae
Rhachidosoraceae Diplaziopsidaceae Aspleniaceae Hemidictyaceae
Rhachidosoraceae
Diplaziopsidaceae Aspleniaceae Hemidictyaceae
Diplaziopsidaceae
Aspleniaceae Hemidictyaceae
Aspleniaceae
Hemidictyaceae
Thelypteridaceae Woodsiaceae Onocleaceae Blechnaceae Athyriaceae
Thelypteridaceae
Woodsiaceae Onocleaceae Blechnaceae Athyriaceae
Woodsiaceae
Onocleaceae Blechnaceae Athyriaceae
Onocleaceae Blechnaceae
Onocleaceae
Blechnaceae
Athyriaceae
(eupolypods II)
RhachidosorusR. mesosorus (Makino) Ching R. blotianus Ching R. consimilis Ching R. pulcher (Tagawa) Ching
R. mesosorus (Makino) Ching
R. blotianus Ching R. consimilis Ching R. pulcher (Tagawa) Ching
R. blotianus Ching
R. consimilis Ching R. pulcher (Tagawa) Ching
R. consimilis Ching
R. pulcher (Tagawa) Ching