Polystichum puteicola, sp. nov. (sect. Haplopolystichum, Dryopteridaceae) from a karst sinkhole in Guizhou, China based on molecular, palynological, and morphological evidence
Polystichum puteicola, sp. nov. (sect. Haplopolystichum, Dryopteridaceae) from a karst sinkhole in Guizhou, China based on molecular, palynological, and morphological evidence
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DOI：
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发表时间：
2010
影响因子：
3.4
通讯作者：
Li‐Bing Zhang;Hai He;Q. Luo
中科院分区：
文献类型：
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作者：
Li‐Bing Zhang;Hai He;Q. Luo
贵州西北部喀斯特岩溶陷落洞中发现一新种——毛蕨（单蕨科）。该新种与分布于中国西南台湾至印度-喜马拉雅西部石灰岩地区的P. obliquum在形态上相似。具叶面不向基部收缩（具最大的基部羽片），叶柄鳞片背面深棕色，轴鳞片可达3.6×0.8毫米，羽片深绿色，近皮质，有光泽的正面，和在边缘上稍重或几乎全缘，微鳞片可达2×0.5毫米。相比之下，斜叶茅的叶片基部的羽片收缩，叶柄的鳞片正面为棕色，轴的鳞片可达2.3×0.5毫米，羽片绿色，沙质，正面无光泽，边缘有细锯齿，微鳞0.2-0.5×0.1-0.2毫米。最有趣的是，这两个物种在叶绿体trl - f基因间隔段的DNA序列中有7个位置不同。我们的系统发育分析表明，这两个物种甚至不是近亲。孢粉学上，p.p uteicola在其外胚芽上具有许多小刺的冠状雕刻。给出了新种在地理分布、生态学、孢子形态、trnL-F序列等方面的特点。保护评估也按照世界自然保护联盟的指导方针提出。
A new fern species, Polystichum puteicola (sect. Haplopolystichum, Dryopteridaceae), is described from a karst sinkhole in northwestern Guizhou, China. The new species is morphologically similar to P. obliquum, a species disjunctly occurring in limestone areas in Taiwan, southwestern China to the western Indo-Himalaya. Polystichum puteicola has lamina not contracted towards base (with the largest basal pinnae), petiole scales dark brown adaxially, rachis scales up to 3.6×0.8 mm, pinnae dark green, subcoriaceous, lustrous adaxially, and slightly repand or almost entire on margin, and microscales up to 2×0.5 mm. In contrast, P. obliquum has lamina with basal pinnae contracted, scales of petiole brown adaxially, scales of rachis up to 2.3×0.5 mm, pinnae green, chartaceous, matt adaxially, and serrulate on margin, and microscales 0.2-0.5×0.1-0.2 mm. Most interestingly, the two species differs in seven positions in the DNA sequences of chloroplast trnL-F intergenic spacer. Our phylogenetic analysis shows that the two species are even not closely related. Palynologically, P. puteicola has cristate sculpture with numerous spinules on its perispore. Features of the new species in geographical distribution, ecology, spore morphology, and trnL-F sequence are given. Conservation assessments are also presented following the IUCN guidelines.