The filmy fern genus Trichomanes mainly comprises Neotropical species and a few taxa in Africa and the western Indian Ocean. The aim of this study is to infer the phylogenetic placement of all five Afro-Malagasy taxa in the genus and to investigate their history via an expanded and dated phylogenetic analysis including 39 species representing over half the diversity of the genus. The results support the monophyly of Trichomanes including all the sampled species attributed to the genus, but also suggest the inclusion of the species Abrodictyum cellulosum, revealing a morphological diversity of the genus greater than what was traditionally recognized, and highlighting the importance of the campanulate sorus as a generic diagnostic character. To accommodate those new phylogenetic results and morphological investigations, we describe a new subgenus Afrotrichomanes grouping the Afro-Malagasy taxa (except T. crenatum). The dated history of the genus among the trichomanoids suggests at least two origins for the Palaeotropical species. A recent Cainozoic colonization from the Neotropics towards Africa gave rise to the West African taxon T. crenatum, and a possible Mesozoic vicariance event gave rise to subgenus Afrotrichomanes. The low species diversity of the genus in the Afro-Malagasy region is discussed.

中文翻译：

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对毛蕨属（Hymenophyllaceae，Polypodiidae）多样性、分类学和历史的新见解，重点关注非洲和西印度洋

膜蕨属毛蕨属主要包括新热带物种和非洲和西印度洋的少数分类群。本研究的目的是推断该属中所有五个非洲-马达加斯加分类群的系统发育位置，并通过扩展和过时的系统发育分析来调查它们的历史，其中包括代表该属一半以上多样性的 39 个物种。结果支持毛毛虫的单系性，包括归属于该属的所有采样物种，但也表明包括 Abrodictyum cellulosum 物种，揭示了该属的形态多样性大于传统公认的多样性，并突出了钟状 sorus 的重要性作为通用诊断字符。为了适应那些新的系统发育结果和形态学研究，我们描述了一个新的亚属 Afrotrichomanes 将非洲-马达加斯加分类群（T. crenatum 除外）分组。滴虫类中该属的过时历史表明古热带物种至少有两个起源。最近从新热带到非洲的新生代殖民化产生了西非分类群 T. crenatum，并且可能的中生代变异事件产生了 Afrotrichomanes 亚属。讨论了非洲-马达加斯加地区该属的低物种多样性。一个可能的中生代变异事件产生了非洲毛毛虫亚属。讨论了非洲-马达加斯加地区该属的低物种多样性。一个可能的中生代变异事件产生了非洲毛毛虫亚属。讨论了非洲-马达加斯加地区该属的低物种多样性。