| 2 | Diversity,taxonomy,and history of the tropical fern genus Didymoglossum Desv.(Hymenophyllaceae,Polypodiidae)in Africa显示文摘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. | Jean-Yves Dubuisson Adèle Nivart Ehoarn Bidault Vincent Deblauwe Vincent Droissart Narcisse GKamdem Germinal Rouhan Atsushi Ebihara Timothée le Péchon | 2024 | Journal of Systematics and Evolution2024，62，1： | 0 |
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