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Micromorphological characters of leaf epidermis of 16 published species from Schizostachy um Nees and its allies( including Melocanna Trin. , Pseudostachyum Munro, Leptocanna Chia et H. L. Fung and Cephalostachyum Munro)were examined by both light and scanning electron microscopies. The results indicated that the papillae forms and distributionalpatterns on the abaxial surface were taxonomically informative at the generic level. The characters of papillae did notsupport Schiz ostachyum sensu lato; meanwhile, it was supported that Melocanna, Pseudostachyum and Cep halostachyumwere better to be treated as separate genera respectively. Furthermore, it seemed to be more appropriate to place Leptocannachinensis and Schizostachyum sanguineum in Cep halostachyum; and to place Cephalostachyum pergr acile and C1 virgatumin Schizostachy um . 相似文献
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井冈寒竹属(又名短枝竹属,Gelidocalamus Wen)是1982年温太辉以产于井冈山区的井冈寒竹Gelidocalamus stellatus Wen为模式种建立的新属。自井冈寒竹属建立以来,陆续有新的分类群发表,或将一些分类群归并到本属中,但迄今尚未开展系统研究。为了发现更多的井冈寒竹属分类学证据,本研究利用扫描电镜对井冈寒竹属9个分类群的叶表皮微形态特征进行了观察。结果表明:9个分类群竹叶下表皮的长细胞、微毛、大毛的形态和分布较为一致,但乳突、刺毛、气孔器和短细胞呈现较丰富的微形态差异。尤其是乳突的形状、气孔器及其周围的乳突排列式样最为丰富,具有重要的分类学价值,可以作为属内种的划分依据。 相似文献
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利用光学显微镜对兜兰属(Paphiopedilum)23种植物叶片进行观察,并对其中14种叶表皮微形态性状测量数值进行主成分分析和聚类分析。结果显示:23种植物叶表皮均有较厚角质层,上表皮细胞多为多边形和卵圆形,无气孔分布,部分种叶上表皮细胞有表皮毛,表皮细胞表面会形成乳突状突起,并且一个细胞只形成一个乳突,多数种的叶表面会呈现明显或不明显的龟背隆起,细胞大小及细胞密度在不同种之间存在极大差异;气孔器广泛分布于下表皮,由保卫细胞构成,排列无规则,外壁呈不同程度加厚。主成分分析表明,特征值大于1的主成分共有4个,基于4个主成分进行聚类,结果可将兜兰属分为两大类,即宽瓣亚属(Brachypetalum)和兜兰亚属(Paphiopedilum),小萼亚属(Parvisepalum)被聚类于宽瓣亚属中。本研究表明兜兰属种间部分叶表皮形态特征具有一定的稳定性,叶片表皮细胞的形状与垂周壁式样变异不大;受环境气候的影响,气孔器大小及气孔密度在不同种间的分布不同,表现出种间多样性,因此这部分叶表皮微形态特征可作为其分类的参考依据。 相似文献
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利用扫描电子显微镜对鼠李科(Rhamnaceae)14属41种4变种的叶表皮形态进行了观察。结果表明:鼠李科植物叶表皮纹饰为皱状或网状,表面近光滑、具条纹或鳞片状粗糙;除蛇藤(Colubrina asiatica)叶上表皮有少量气孔外,其余植物气孔只存在于下表皮,椭圆形、卵形或圆形,孔盖光滑或具波纹状、颗粒状、瘤状、鳞片状附属物;孔盖内缘光滑、浅波状或外卷。这些叶表皮微形态对于一些种及种下分类群的划分有一定的参考作用。 相似文献
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水龙骨亚科植物叶表皮微形态及其系统学意义 总被引:1,自引:0,他引:1
利用光学显微镜对水龙骨亚科(Subfam.Polypodioideae Nayar)4属11种1变种植物,即篦齿蕨、日本水龙骨、光茎水龙骨、栗柄水龙骨、假毛柄水龙骨、假友水龙骨、中华水龙骨、友水龙骨、柔毛水龙骨、喜马拉雅水龙骨、蒙自拟水龙骨和穴果棱脉蕨植物的叶表皮微形态进行了观察比较。结果表明:该亚科植物的叶表皮细胞都为不规则型,垂周壁为波状或深波状。它们的气孔器类型有7种,为极细胞型、共环极细胞型、腋下细胞型、聚腋下细胞型、不等细胞型、不规则四细胞型和不规则细胞型。对篦齿蕨属与多足蕨属、栗柄水龙骨与篦齿蕨、光茎水龙骨与日本水龙骨的亲缘关系进行了讨论。 相似文献
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用扫描电镜和光学显微镜对[竹思]簩竹属(Schizostachyum Nees)7个种,及其近缘的梨竹属(Melocanna Trin.)、泡竹属(Pseudostachyum Munro)、薄竹属(Lepzocanna Chia et H.L.Fung)各1个种以及空竹属(Cephalostachyum Munro)6个种的叶表皮微形态特征进行了观察。结果表明竹叶下表皮乳突的形状和在气孔器上及周围的排列式样在这5个属中各有不同,具有重要的分类学和系统学价值。同时我们的结果不支持广义的笃竹属;而梨竹属、空竹属和泡竹属则被支持独立成属。另外,薄竹(Leptocanna chinensis)和红毛[竹思]簩竹(Schizostachyum sanguineum)的叶表皮微形态特征非常接近空竹属;香糯竹(Cephalostachyum pergracile)和金毛空竹(C.virgatum)的叶表皮微形态特征则十分接近[竹思]簩竹属。 相似文献
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广东竹亚科新组合及新异名 总被引:2,自引:0,他引:2
报道了广东竹亚科13新组合,1新名称和3新异名,其中筋竹属3新组合1新名称,牡竹属4新组合,青篱竹属5组合1新异名,箬竹属2新异名及方竹属1新组合. 相似文献
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Foliar micromorphology of Solanum pseudocapsicum was investigated by electron microscopical examination. The leaves are characterized by anisocytic stomata which are more abundant on the abaxial surfaces. The leaves have short multicellular glandular trichomes sparsely distributed over the entire leaf surfaces. Crystal deposits were also observed on the surfaces above the stomata. Energy dispersive X-ray spectroscopy-SEM showed that Al, K, Na and Si were the major constituents of the crystals analyzed. The presence of glandular trichomes in this plant could be the source of poisonous compounds that are characteristic of this species. 相似文献
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An ultrastructural study of taxonomically significant characters of the Thraustochytriales and the Labyrinthulales 总被引:3,自引:0,他引:3
STEPHEN T. MOSS 《Botanical journal of the Linnean Society. Linnean Society of London》1985,91(1-2):329-357
Labyrinthulales and Thraustochytriales are marine, biflagellate protists of uncertain taxonomic affinities. Initial classifications of the Thraustochytriales in the Mycota and Labyrinthulales in the Mycetozoa, Rhizopodea and algae were based on their different superficial morphologies. These differences are not paralleled at the ultrastructural level. Both orders are characterized by a unique organelle termed the sagenogenetosome, an ectoplasmic net and a wall comprised of dictyosome-derived scales. These characters are considered of taxonomic importance and support close phylogeny of the orders to each other and their removal from the Mycota, Mycetozoa and Rhizopodea. 相似文献
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One new species of the genus lndocalamus (Bambusoideae) is describedfrom China . It is lndocalamus chishuiensis Y. L. Yang et Hsueh. 相似文献
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Qiao‐Mei Qin Yi‐Hua Tong Xi‐Rong Zheng Jing‐Bo Ni Tien‐Chinh Vu Nian‐He Xia 《Nordic Journal of Botany》2019,37(1)
Here we describe and illustrate a new species, Melocalamus grandiauritus N.H. Xia, Q.M. Qin & J. B. Ni sp. nov., from the lowland forest in Thanh Hoa Province, Vietnam. Molecular phylogeny based on the GBSSI indicates that this species is a member of Melocalamus. Morphologically, M. grandiauritus is different from all congeneric species in Vietnam. It is somewhat similar to M. pacoensis H.N.Nguyen & V.T.Tran, but is easily distinguished by having much wider suborbicular culm leaf auricles, very high and ventricose auricles of foliage leaves, entire ligules of both culm leaves and foliage leaves, and large leaf blades. 相似文献
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【目的】摸清贵州竹类资源本底,以补充和丰富贵州现有竹类资料,为后续竹产业的规划发展提供一定的依据。【方法】以“面”“点”结合的方式进行野外调查,标本的采集和鉴定,以及相关资料的查阅,整理出此前从未有分布记录的属和种。【结果】发现了贵州省竹类植物新纪录的1个属和6个种,即[/思]簩竹属(Schizostachyum)、[/思]簩竹(S. pseudolima McClure)、鸡窦簕竹(Bambusa funghomii McClure)、龙山玉山竹(Yushania longshanensis D. Z. Li & X. Y. Ye)、滑竹(Y. polytricha Hsueh et Yi)、少枝玉山竹(Y. pauciramificans Yi)和抱鸡竹(Y. punctulata Yi),现予以报道。【结论】这些新纪录属和种在贵州的发现扩展了其分布范围,同时丰富了贵州竹类植物的多样性。 相似文献
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A clambering bamboo endemic to northern Vietnam is shown to represent a new species, M. trangdinhensis H.N.Nguyen & V.T.Tran (Gramineae: Bambusoideae‐Bambusinae), which is described and illustrated. It is similar to M. tonkinensis in general appearance, but differs by being covered with appressed white hairs, and by auricles lacking or forming a low rim only, smaller leaf blade 20–24 × 2.3–2.5 cm, and smaller glumes 6–7 × 4.0–4.5 mm. A key to all species of the genus is included. 相似文献
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中国水鳖科( Hydrocharitaceae )植物的果皮微形态特征 总被引:1,自引:0,他引:1
应用扫描电镜对国产水鳖科6属植物的果皮微形态特征进行了初步的观察。结果表明水鳖科各属植物在果皮表面纹饰及表皮细胞形态,径向壁和横向壁凸出与否等特征上存在差异,可以作为属间分类的依据之一。从果皮微形态特征来看,水鳖属和海菜花属差异很大,支持将它们分别作为不同的族处理的观点,而水筛属和苦草属则较为近缘。果皮微形态下的观察结果表明水鳖科和泽泻科植物在果皮表面细胞形态,径向壁明显凸出等方面十分相似,因而支持了水鳖科与泽泻目近缘的观点。 相似文献