Asplenium danxiaense sp. nov. (Aspleniaceae, Aspleniineae), a new tetraploid fern species from Guangdong, China, based on morphological and molecular data
Asplenium danxiaense sp. nov. (Aspleniaceae, Aspleniineae), a new tetraploid fern species from Guangdong, China, based on morphological and molecular data
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DOI：
10.5852/ejt.2022.798.1679
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发表时间：
2022-03-07
影响因子：
1.2
通讯作者：
Mao, Ling-Feng
中科院分区：
文献类型：
--
作者：
Xu, Ke-Wang;Lin, Chen-Xue;Mao, Ling-Feng
共生体分布于东亚和东南亚，其分布中心在中国西南部。在本研究中，我们以广东丹霞地貌的两个样本进行了详细的形态学、细胞学和系统发育研究。利用最大似然和贝叶斯推理分别分析了5个叶绿体标记和1个核标记的序列。形态学和系统发育分析支持在广东省丹霞山洞穴中发现一新种（a. danxiaense k.w.许sp. 11）。该新种与a . coenobiale和a . pulcherrimum的区别在于鳞片窄三角形至披针形，先端末端为短尖尾，基部基生小针叶通常最大，可育段较少，外孢子长度通常大于50 μ m，在该复合体中与其他物种表现出明显的分子差异。给出了详细的描述和插图。
The Asplenium coenobiale complex is distributed in Eastern Asia and Southeast Asia with its distribution center in southwestern China. In this study, we carried out a detailed morphological, cytological, and phylogenetic study by adding two samples from Danxia landform in Guangdong. The sequences of five chloroplast markers and one nuclear marker of the A. coenobiale complex were analyzed with maximum likelihood and Bayesian inference, respectively. The morphological and phylogenetic analyses support the recognition of a new species (A. danxiaense K.W.Xu sp. nov.) of the A. coenobiale complex from a cave of Danxia mountain, Guangdong province, southern China. This new species can be distinguished from A. coenobiale and A. pulcherrimum by having scales narrowly triangular to lanceolate, apex ending in a short apical tail, basal basiscopic pinnule usually largest, fertile segment scarce, and exospore length usually more than 50 mu m and shows significant molecular differences from other species in this complex. A detailed description and illustrations are presented.