Diversity,taxonomy,and history of the tropical fern genus Didymoglossum Desv.(Hymenophyllaceae,Polypodiidae)in Africa  

作　　者：Jean-Yves Dubuisson Adèle Nivart Ehoarn Bidault Vincent Deblauwe Vincent Droissart Narcisse GKamdem Germinal Rouhan Atsushi Ebihara Timothée le Péchon 

机构地区：[1]Institut de Systématique,Evolution,Biodiversité(ISYEB),Sorbonne Université,MNHN,CNRS,EPHE,Université des Antilles,CP 48,57 rue Cuvier 75005 Paris,France [2]Missouri Botanical Garden,Africa&Madagascar Department,4344 Shaw Boulevard,Saint Louis,MO 63110,USA [3]Institut de Systématique,Evolution,Biodiversité(ISYEB),Muséum national d'Histoire naturelle,CNRS,SU,EPHE,Universitédes Antilles,CP 39,57 rue Cuvier,75005 Paris,France [4]Herbarium et Bibliothèque de Botanique africaine,CP 265,Université Libre de Bruxelles,Boulevard du Triomphe,B-1050 Brussels,Belgium [5]International Institute of Tropical Agriculture(IITA),BP 2008(Messa),Yaoundé,Cameroon [6]Center for Tropical Research,Institute of the Environment and Sustainability,University of California Los Angeles,Los Angeles,CA 90095,USA [7]AMAP Lab,Univ.Montpellier,IRD,CNRS,INRAE,CIRAD,Montpellier,France [8]Plant Systematics and Ecology Laboratory,Higher Teachers'Training College,University of Yaoundé I,Yaoundé,Cameroon [9]Department of Botany,National Museum of Nature and Science,4-1-1 Amakubo,Tsukuba 305-0005,Japan [10]Meise Botanic Garden,Nieuwelaan 381860 Meise,Belgium [11]Fédération Wallonie-Bruxelles,Service Général de l'Enseignement supérieur et de la Recherche scientifique,1 rue A.Lavallée 1080 Bruxelles,Belgium

出　　处：《Journal of Systematics and Evolution》2024年第1期84-101,共18页植物分类学报（英文版）

摘　　要：The fern genus Didymoglossum(Hymenophyllaceae)is not so diverse in Africa with seven species at most.However,its local taxonomy is surprisingly still strongly debated,in particular within the Didymoglossum erosum complex interpreted either as a single polymorphic species or as a group of at least three distinct but morphologically very close taxa(D.erosum,Didymoglossum chamaedrys,and Didymoglossum benli).Investigating these taxonomic issues and more generally the diversity of the genus in Africa and its origin,we conducted a complete anatomo-morphological analysis coupled with a molecular phylogenetic work based on rbcL.Our results support the recognition of all seven species,including Didymoglossum robinsoni that is likely distinct from the Neotropical Didymoglossum reptans to which the African populations were traditionally attributed.We here propose new characters and a novel key to distinguish the seven African species which also include Didymoglossum ballardianum,Didymoglossum lenormandi,and Didymoglossum liberiense.Once the taxonomy is clarified with respect to the distinct evolutionary lineages evidenced,the biogeographic history of the genus in Africa is discussed based on a divergence time estimation and the reconstruction of the ancestral geographic areas.These analyses reveal a Mesozoic(Cretaceous)vicariance event within Didymoglossum which is the second one hypothesized for the family Hymenophyllaceae.

关 键 词：BIOGEOGRAPHY filmy ferns VICARIANCE western Indian Ocean. 

分 类 号：Q95[生物学—动物学]