AI Article Synopsis

  • The study analyzes the largest fern genus, Asplenium, using DNA sequences from six plastid markers across 1030 accessions, representing about 60% of its estimated species diversity.
  • It confirms that Asplenium, as a broad group, is monophyletic and identifies 11 major clades with well-supported relationships among them.
  • The findings reveal previously unsampled species and suggest new relationships, highlighting the potential for discovering cryptic species and guiding future research on geographical diversification and speciation within the family.

Article Abstract

The infrageneric relationships and taxonomy of the largest fern genus, Asplenium (Aspleniaceae), have remained poorly understood. Previous studies have focused mainly on specific species complexes involving a few or dozens of species only, or have achieved a large taxon sampling but only one plastid marker was used. In the present study, DNA sequences from six plastid markers (atpB, rbcL, rps4, rps4-trnS, trnL and trnL-F) of 1030 accessions (616 of them newly sequenced here) representing c. 420 species of Asplenium (60% of estimated species diversity), 16 species of Hymenasplenium, three Diplaziopsidaceae, and four Rhachidosoraceae were used to produce the largest genus-level phylogeny yet for ferns. Our major results include: (i) Asplenium as broadly circumscribed is monophyletic based on our inclusion of representatives of 32 of 38 named segregate genera; (ii) 11 major clades in Asplenium are identified, and their relationships are mostly well-resolved and strongly supported; (iii) numerous species, unsampled in previous studies, suggest new relationships and numerous cryptic species and species complexes in Asplenium; and (iv) the accrued molecular evidence provides an essential foundation for further investigations of complex patterns of geographical diversification, speciation and reticulate evolution in this family.

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http://dx.doi.org/10.1111/cla.12384DOI Listing

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