Gymnosphaera represents a minor lineage within the scaly tree-fern family Cyatheaceae.Tropical and subtropical mainland Asia is a main distribution area of Gymnosphaera.However,the species diversity of Gymnosphaera is currently incompletely known in mainland Asia due to lacking critical revision.Here we present new findings of species diversity and their relationships to mainland Asian Gymnosphaera based on field surveys,the examination of herbarium collections,and phylogenetic analyses of sequences of multiple chloroplast and nuclear regions.Two new species,G.saxicola from southwestern Yunnan and G.bachmaensis from central Vietnam,are established.Traditionally recognized G.podophylla is revealed to be a complex,from which G.bonii is reinstated as a distinct species.Our phylogenetic analyses identified four clades within Gymnosphaera in mainland Asia:G.denticulata clade,G.gigantea clade,G.podophylla clade,and G.salletii clade.The new species G.saxicola,which is special for its saxicolous habitat,was resolved as sister to G.austroyunnanensis in the G.salletii clade.The newly discovered G.bachmaensis,which is characterized specially by the spathulate frond,was positioned in the G.podophylla clade,being sister to G.bonii.The mountainous region from south-central Vietnam northwards to western Yunnan is a diverse center of Gymnosphaera and more species of this group are probably to be discovered there.

Shi-Yong Dong;Zheng-Yu Zuo;Yong Xiao;Ling Huang;Van The Pham;Ke Loc Phan;Ming Kang

Key Laboratory of Plant Resources Conservation and Sustainable Utilization,South China Botanical Garden,Chinese Academy of Sciences,Guangzhou 510650,China;Center of Conservation Biology,Core Botanical Gardens,Chinese Academy of Sciences,Guangzhou 510650,China;Germplasm Bank of Wild Species,Kunming Institute of Botany,Chinese Academy of Sciences,Kunming 650201,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Life Sciences,Yunnan University,Kunming 650500,China;Environmental Engineering and Management Research Group,Ton Duc Thang University,Ho Chi Minh,Vietnam;Faculty of Environment and Labour Safety,Ton Duc Thang University,Ho Chi Minh City,Vietnam;Faculty of Biology,VNU University of Science,Hanoi,Vietnam

植物分类学报

[1]Shi-Yong Dong;Zheng-Yu Zuo;Yong Xiao;Ling Huang;Van The Pham;Ke Loc Phan;Ming Kang-.A contribution to Gymnosphaera(Cyatheaceae)in mainland Asia:Two new species,reinstatement of Cyathea bonii,and their phylogenetic positions)[J].植物分类学报,2022(02):433-444

Gymnosphaera,reinstatement,Cyathea,bonii,scaly,herbarium,bachmaensis,reinstated,salletii,saxicolous,austroyunnanensis,spathulate,frond

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