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Phylogeny of cryptogrammoid ferns and related taxa based on rbcL sequences
Author(s) -
Zhang Gangmin,
Zhang Xianchun,
Chen Zhiduan
Publication year - 2003
Publication title -
nordic journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.333
H-Index - 33
eISSN - 1756-1051
pISSN - 0107-055X
DOI - 10.1111/j.1756-1051.2003.tb00421.x
Subject(s) - pteridaceae , sensu , biology , taxon , monophyly , dryopteridaceae , botany , clade , phylogenetic tree , maximum parsimony , zoology , genus , fern , genetics , gene
Cryptogrammoid ferns were often classified into the cheilanthoid group (of Pteridaceae sensu Tryon et al.) or Sinopteridaceae sensu Ching. In order to elucidate the phylogenetic relationships of cryptogrammoid ferns and their related taxa, we sequenced the chloroplast rbcL gene for 11 Asian species representing Cryptogramma, Onychium, Aleuritopteris, Leptolepidium, Cheilosoria, and Doryopteris. Sequences of other related groups were obtained from GenBank. Phylogenetic analysis of a data matrix including 32 taxa was conducted using the maximum‐parsimony (MP) and neighbor‐joining (NJ) methods. The results were as follows: (1) Cryptogramma, Coniogramme, and Llavea form a moderately supported clade and constitute a cryptogrammoid group that is distantly related to the cheilanthoid ferns. (2) Onychium is rejected from both the cheilanthoid and the cryptogrammoid group, but closely related to Actiniopteris and Pteris. (3) The cheilanthoid group is monophyletic, which is supported by a high bootstrap value. It comprises most of the genera in Sinopteridaceae sensu Ching and some genera in Hemionitidaceae sensu Pichi Sermolli. (4) In the cheilanthoid group, several genera from the Old World (including Aleuritopteris, Leptolepidiurn, Cheilosoria, and Sinopteris), which have been subsumed into Cheilanthes by some authors, are grouped together and distantly related to the American taxa of Cheilanthes. The present study supports the treatment of the cryptogrammoids as either a separate family or subfamily of a broadly circumscribed Pteridaceae, but Pichi Sermolli's circumscription of Cryptogrammaceae should be emended to include Coniogramme and to exclude Onychium.