Polystichum perpusillum (sect. Haplopolystichum, Dryopteridaceae), a New Fern Species from Guizhou, China
Polystichum perpusillum (sect. Haplopolystichum, Dryopteridaceae), a New Fern Species from Guizhou, China
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DOI：
10.5735/085.049.0109
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发表时间：
2012-04
期刊：
影响因子：
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通讯作者：
Li‐Bing Zhang;Hai He
中科院分区：
文献类型：
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作者：
Li‐Bing Zhang;Hai He
耳蕨Zhang & H.本文描述了贵州南部喀斯特洞穴洞穴入口处的耳蕨属单耳蕨组一新种。基于叶绿体trnL-F序列的系统发育分析表明，它是在该节中没有近亲的遗传隔离。在形态上，它类似于P. minutissimum，但P. perpussillum有一个尖锐的叶片顶端，每个叶片上有多达12对羽状花序，以及正三角形卵形或卵状披针形的轴鳞片，而P. minutissimum有一个圆形的叶片顶端，每个叶片上有5-8对羽状花序，以及钻形或线形的轴鳞片。耳蕨（Polystichumperpussillum）的外孢子上有疣状纹饰，这在耳蕨属中是罕见的。该物种被认为是极度濒危物种。
Polystichum perpusillum L.B. Zhang & H. He, a new fern species of Polystichum sect. Haplopolystichum (Dryopteridaceae), is described and illustrated from the entrance to a karst cave in southern Guizhou, China. A phylogenetic analysis based on the chloroplast trnL-F sequences shows that it is phylogenetically isolated in the section with no close relatives. Morphologically, it is similar to P. minutissimum, but P. perpusillum has an acute lamina apex, up to 12 pairs of pinnae per lamina, and deltoid-ovate or ovate-lanceolate rachis scales, while P. minutissimum has a round lamina apex, 5–8 pairs of pinnae per lamina, and subulate or linear rachis scales. Polystichum perpusillum has a granulate sculpture with Verrucae on its perispore, a sculpture rare in the genus. The species is considered to be critically endangered.