| 摘要: |
| 凤了蕨属（Coniogramme Fée）隶属广义凤尾蕨科的珠蕨亚科，曾根据叶脉是否联结形成网眼被分为离脉组（sect. Coniogramme）和网脉组（sect. Notogramme）。后者主要包括以日本凤了蕨（C. japonica）为代表的叶脉具网结现象的类群。迄今为止，有关凤了蕨属的系统发育研究很少，网脉组各类群之间的系统发育关系一直存有争议。由于对形态性状的理解不同，不同学者对各类群的分类处理也存在分歧。为解决凤了蕨属网脉组特别是日本凤了蕨及其相关类群分类上的混乱，该文整合分子系统学和形态学的研究结果，对该类群的系统发育关系和分类进行探讨。结果表明：（1）邢公侠概念的凤了蕨属网脉组并不是一个单系,只有那些叶脉具有2~3行连续网眼的种类属于该类群。（2）C. gracilis在系统发育树上独立成一个分支，并与日本凤了蕨、南岳凤了蕨（C. centrochinensis）和安康凤了蕨（C. ankangensis）等形成的分支互为姊妹群。结合形态学证据，该文支持给予其种级地位。（3）日本凤了蕨、南岳凤了蕨和安康凤了蕨在形态上存在中间过渡形式，三者没有明显的区分且在系统发育树上聚为一个单系类群，支持将南岳凤了蕨和安康凤了蕨作为日本凤了蕨的异名处理。该文对传统概念的网脉组重新定义，该组共包含2种，即日本凤了蕨和C. gracilis。 |
| 关键词: 凤了蕨属网脉组，日本凤了蕨复合群，分子系统学，形态学，物种界定 |
| DOI：10.11931/guihaia.gxzw202411054 |
| 分类号:Q949.36 |
| Fund project:国家自然科学基金（31770221）。 |
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| Exploring the phylogeny and species delimitation of Coniogramme sect. Notogramme based on chloroplast genome and morphological evidence |
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CONG Wei1, YANG Wenli2, YAN Pengpeng1, WU Die1, ZHANG Gangmin1*
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1. College of Ecology and Nature Conservation, Beijing Forestry University, Beijing 100083, China; 2. College of Forestry, Hebei Agricultural University, Baoding 071000, Hebei, China
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| Abstract: |
| Coniogramme Fée, which belongs to Cryptogrammoideae of Pteridaceae, was divided into sect. Coniogramme and sect. Notogramme based on whether the leaf veins were connected to form an areole. The latter mainly includes the taxa with anastomosing veins represented by C. japonica. So far, there has been little systematic research on the phylogenetics of the genus Coniogramme. The phylogenetic relationship among species of sect. Notogramme has long been in controversy. Moreover, the taxonomic treatment was confused due to different understandings of morphological traits. In this paper, the phylogenetic relationships and taxonomy of the sect. Notogramme and related species based on molecular and morphological analyses were investigated. The results were as follows: (1) Sect. Notogramme sensu Shing is not a monophyletic group. Only the species with 2-3 rows of areoles along each side of midrib belong to this group. (2) C. gracilis formed a well-supported monophyletic clade, which was sister to the clade formed by C. japonica, C. centrochinensis and C. ankangensis. Combining with morphological evidence, this study suggested that C. gracilis should be recognized as a distinct species. (3) There was no obvious morphological distinction among C. japonica, C. centrochinensis and C. ankangensis, and they clustered into a monophyletic group in the phylogenetic tree. C. centrochinensis and C. ankangensis should be treated as synonymies of C. japonica. The traditional concept of sect. Notogramme was redefined in this paper. This section consists of two species, namely C. japonica and C. gracilis. |
| Key words: Coniogramme sect. Notogramme, C. japonica complex, molecular phylogeny, morphology, species delimitation |
