@ARTICLE{TreeBASE2Ref27585, author = {Shi-yong Dong and Zheng-yu Zuo}, title = {On the recognition of Gymnosphaera as a distinct genus in Cyatheaceae}, year = {2017}, keywords = {chloroplast DNA sequences, new combinations, morphology, phylogeny, scaly tree ferns, taxonomy}, doi = {}, url = {http://}, pmid = {}, journal = {Annals of the Missouri Botanical Garden}, volume = {}, number = {}, pages = {}, abstract = {The Cyatheaceae is a large family, containing over 600 species of scaly tree ferns. Its taxonomic subdivision has troubled pteridologists for more than one century. Recent molecular analyses have revealed four monophyletic groups (Alsophila, Cyathea, Gymnosphaera, and Sphaeropteris) within this family. However, one of the four groups, Gymnosphaera, was still submerged in Alsophila in a modern classification proposed by the Pteridophyte Phylogeny Group due to Gymnosphaera was phylogenetically underrepresented in previous studies. In this study we add the sampling of Gymnosphaera from its main distribution area (SE Asia) and conduct phylogenetic analyses of datasets containing individual and combined five cpDNA regions (rbcL, rbcL-accD, rbcL-atpB, trnG-trnR, and trnL-trnF) of 121 scaly tree ferns using three methods (maximum parsimony, maximum likelihood, and Bayesian inference). The result is congruent with previous studies, consistently resolving scaly tree ferns as four well-supported clades with Sphaeropteris sister to the other three, and shows a probability for the first time on the relationships between Alsophila, Cyathea, and Gymnosphaera, i.e., Alsophila is sister to Gymnosphaera and then together as sister to Cyathea. As well supported to be distinct from Alsophila in molecular phylogeny, in morphology, and in sporogenetic mechanism, Gymnosphaera is reinstated here, with a minor emendation in circumscription, as a separate genus. To facilitate the application of species? names and future revision, we provide a checklist of 45 taxa now known in Gymnosphaera with information of nomenclatural types and general distributions; among them 24 are new combinations.} }

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