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Pteridryaceae: A new fern family of Polypodiineae (Polypodiales) including taxonomic treatments
Author(s) -
Zhou XinMao,
Zhang Liang,
Lu Ngan Thi,
Gao XinFen,
Zhang LiBing
Publication year - 2018
Publication title -
journal of systematics and evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.249
H-Index - 46
eISSN - 1759-6831
pISSN - 1674-4918
DOI - 10.1111/jse.12305
Subject(s) - monophyly , biology , clade , botany , phylogenetic tree , taxon , maximum parsimony , evolutionary biology , genetics , gene
We undertook phylogenetic analyses to resolve the relationships of Pteridrys and related taxa based on six plastid markers ( atpA , atpB , matK & rps16‐matK , rbcL , rps4 & rps4‐trnS , and trnL & trnL‐F ) and nuclear pgiC . We included 195 accessions representing approximately 147 species in 38 genera, and seven of the nine families in Polypodiineae (eupolypods I). Tectariaceae s.l. (i.e., Arthropteris , Draconopteris , Hypoderris , Malaifilix , Pteridrys , Tectaria , and Triplophyllum in addition to Polydictyum ) is recovered as monophyletic (97% maximum likelihood bootstrap value), but with low (<50%) maximum parsimony jackknife value. The family Tectariaceae s.l. is therefore the only family in ferns without a corresponding non‐parametric‐based strong support in spite of our data totaling 9616 aligned base pairs. Tectariaceae s.l. can not be unambiguously recognized by any of the 13 morphological characters analyzed. However, if the clade composed of Draconopteris , Malaifilix , Polydictyum , and Pteridrys (DMPP) is recognized as a distinct family, at least four morphological characters enable the distinction of the DMPP clade from its sister clade. Considering the uncertainty in the monophyly, the diagnosability, and the deep divergence, we propose to establish a new family, Pteridryaceae, to accommodate the DMPP clade. Species of Pteridryaceae share mostly the following characteristics: erect to suberect rhizomes, reduced basal pinnae, anastomosing or free venation, absence of catenate hairs at the leaf surface, and perine ornamentation lacking spines or spinules. Identification keys are provided for the four genera and 31 species of the DMPP clade (or Pteridryaceae). Reflecting the presented results, the recognition of Arthropteridaceae is the preferred taxonomic status of the Arthropteris clade.