Desmophlebium

Desmophlebium is a genus of ferns. In the Pteridophyte Phylogeny Group classification of 2016, it is the only genus in the family Desmophlebiaceae.[1] Other sources place it in a more widely defined Aspleniaceae.[2]

Desmophlebium
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Class: Polypodiopsida
Order: Polypodiales
Suborder: Aspleniineae
Family: Desmophlebiaceae
Mynssen, A.Vasco, Sylvestre, R.C.Moran & Rouhan[1]
Genus: Desmophlebium
Mynssen, A.Vasco, Sylvestre, R.C. Moran & Rouhan[1]

Taxonomy

The family and genus were erected in 2016, following a molecular phylogenetic study. It was shown that the species previously known as Diplazium lechleri was sister to a clade formed by the families Hemidictyaceae and Aspleniaceae, considerably removed from the Athyriaceae where it had previously been classified. Accordingly, a new genus and family were created and Diplazium lechleri transferred to Desmophlebium lechleri. Another species was added to the genus on the basis of its morphology.[3]

The generic name refers to the distinctive thickened vein running just inside the edge of a pinna (submarginal) connecting the ends of other veins. The authors derived it from the Greek δεσμός, desmos, meaning 'band', combined with φλεβός, phlebos, meaning 'vein'.[3] (Phlebos is the genitive of φλέψ, phleps, 'vein'.[4])

In the Pteridophyte Phylogeny Group classification of 2016 (PPG I), the family Desmophlebiaceae is a member of the subclass Polypodiidae (the leptosporangiate ferns), order Polypodiales, suborder Aspleniineae – a group known informally as "eupolypods II".[1] A consensus cladogram showing one hypothesis for its relationship to other families in the suborder is:[1]

Aspleniineae
 

Cystopteridaceae

 
 
 
 

Rhachidosoraceae

 
 
 

Diplaziopsidaceae

 
 
 

Desmophlebiaceae

 
 
 

Hemidictyaceae

 
 

Aspleniaceae

 
 
 
 
 
 
 
 

Woodsiaceae

 
 
 
 

Onocleaceae

 
 

Blechnaceae

 
 
 

Athyriaceae

 
 
 
 

Thelypteridaceae

 
 
 
 

Species

As of July 2019, Plants of the World Online accepts two species:[2]

  • Desmophlebium lechleri (Mett.) Mynssen, A.Vasco, Sylvestre, R.C.Moran & Rouhan
  • Desmophlebium longisorum (Baker) Mynssen, A.Vasco, Sylvestre, R.C.Moran & Rouhan
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References
  1. 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
  2. "Desmophlebium Mynssen, A.Vasco, Sylvestre, R.C.Moran & Rouhan", Plants of the World Online, Royal Botanic Gardens, Kew, retrieved 2019-07-26
  3. Mynssen, Claudine M.; Vasco, Alejandra; Moran, Robbin C.; Sylvestre, Lana S. & Rouhan, Germinal (2016), "Desmophlebiaceae and Desmophlebium: A new family and genus of Eupolypod II ferns" (PDF), Taxon, 65 (1): 19–34, doi:10.12705/651.2, retrieved 2019-07-26
  4. Stearn, W.T. (2004), Botanical Latin (4th (p/b) ed.), Portland, Oregon: Timber Press, ISBN 978-0-7153-1643-6, pp. 270, 466
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