| 摘要: |
| 膜叶铁角蕨属隶属于铁角蕨科,全世界约有30种,我国分布有18种,是该属植物的分布中心之一。到目前为止,膜叶铁角蕨属的物种数目和物种分类还存在很大争议,一些物种的界限和定义还模糊不清,为了得到一个自然的膜叶铁角蕨属分类系统,还需要对膜叶铁角蕨属的物种分类做进一步研究。该文在前人研究的基础上,对膜叶铁角蕨属10种植物的形态特征,包括孢子形态特征、叶柄和根状茎上的鳞片形态特征、叶片形态、羽片形状以及叶脉特征等进行详细观察分析,探讨了各个形态特征间的关系以及膜叶铁角蕨属植物的物种分类。结果表明:膜叶铁角蕨属植物的叶片及羽片等形态特征存在很大区别,叶柄和根状茎上的鳞片以及孢子形态的种间差异虽然不大,但其在大小、形状、颜色等方面的细微差别仍可作为部分种类的鉴定依据。该研究结果为膜叶铁角蕨属植物的物种分类及进一步研究提供了重要依据。 |
| 关键词: 膜叶铁角蕨属, 形态学, 物种多样性 |
| DOI：10.11931/guihaia.gxzw201612041 |
| 分类号:Q949 |
| 文章编号:1000-3142(2017)10-1290-11 |
| 基金项目:国家自然科学基金(31500171); 生物标本馆经典分类学青年人才项目(ZSBR-008)[Supported by the National Natural Science Foundation of China(31500171); Special Funds for the Young Scholars of Taxonomy of the Chinese Academy of Sciences(ZSBR-008)]。 |
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| Morphology study of Hymenasplenium |
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HONG Hua-Feng1,2, CHANG Yan-Fen1*
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1. Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, Yunnan, China;2. College of Biological and Chemical Engineering, Pu'er University, Pu'er 665000, Yunnan, China
1. Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla 666303, Yunnan, China;
2. College of Biological and Chemical Engineering, Pu'er University, Pu'er 665000, Yunnan, China
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| Abstract: |
| Hymenasplenium belongs to the fern family Aspleniaceae, which comprises about 800 species, and it has approximately 30 species widely distributed in East and Southeast Asia and tropical America. Hybrids and intraspecific polyploidy are frequently found in Hymenasplenium. Like revealed in Asplenium, another genus comprises over 700 species in Aspleniaceae, hybridization and polyploidization might be key evolutionary processes in Hymenasplenium. Consequences of these processes are species with complex evolutionary history and their taxonomic problems difficult to be resolved. So far, boundaries for several species in Hymenasplenium still remain unclear. Species numbers and taxonomy for this group of plants still need further study. In order to establish a natural classification for Hymenasplenium, traditional taxonomy researches are needed. In this study, morphological characteristics of Hymenasplenium were studied in order to explore the taxonomy and species relationship within this group. The spore morphology, shape of the pinna, scales on the petioles and rhizomes, and the characteristics of the frond veins of ten species of Hymenasplenium were investigated in detail. The results showed that the morphology of fronds and pinnae were valuable characters to distinguish some species such as H. excisum, H. cheilosorum and species among H. retusullum group. However, spore and scale were similar among species in Hymenasplenium and only slightly differed among H. murakami-hatanakae, H. hondoense, H. apogamum and H. cheilosorum. The results indicate that morphological characteristics are important for recognizing species in this genus. However, more evidence should be taken into account in order to revising taxonomy of Hymenasplenium. This study provide evidence for further research of taxonomy and species diversity of Hymenasplenium. |
| Key words: Hymenasplenium, morphology, species diversity |
