Leaves of Taxus with cuticle micromorphology from the Early Cretaceous of eastern Inner Mongolia, Northeast China
Leaves of Taxus with cuticle micromorphology from the Early Cretaceous of eastern Inner Mongolia, Northeast China
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内蒙古东部早白垩世红豆杉叶片角质层微形态
DOI：
10.1016/j.revpalbo.2021.104588
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发表时间：
2021-12-31
影响因子：
1.9
通讯作者：
Crane, Peter R.
中科院分区：
文献类型：
--
作者：
Dong, Chong;Shi, Gongle;Crane, Peter R.
内蒙古东部早白垩世霍林河组产出了丰富多样的植物化石，在此基础上又发现了一个新的Taxes种。产自古城露天煤矿的褐煤叶。霍林郭勒叶蕨Taxis huolingolensis sp. nov.叶线形，叶片渐细，先端锐尖至短尖，基部狭窄，下延，茎状。中脉在叶背面显著突起。叶背表皮具致密、短、等径的乳突，有两条侧生气孔带，每一条侧生气孔带含有3-5个短、不连续的纵行气孔。气孔纵向排列，周生。具2个极侧副细胞和2-4个侧副细胞。每个气孔都有一个或多或少横向伸长的乳突状气孔环，围绕着外角质层表面上的气孔坑。霍林郭勒红豆杉（Taxus huolingolensis sp. nov.）的叶在形态和角质层微形态上与现存红豆杉属（Taxus）的叶相似，在属内与北美种T.短叶。霍林郭勒红豆杉（Taxushuolingolensissp. nov.）的气孔带较窄，气孔列数较少，与其他中生代红豆杉属植物的叶片相似。T. huolingolensis的发现丰富了我们对中生代红豆杉科的认识，并表明早白垩世以来红豆杉已经多样化。(C)2022 Elsevier B. V.保留所有权利。
The Early Cretaceous Huolinhe Formation in eastern Inner Mongolia, northeastern China has yielded abundant and diverse plant fossils, to which we here add a new species of Taxes based on exceptionally well-preserved. lignified leaves from the Gucheng open-cast coal mine. Taxis huolingolensis sp. nov. has linear leaves with a lamina that tapers to an acute to mucronate apex, and narrows into a decurrent, stalk-like base. The midrib is prominently raised on the abaxial leaf surface. The abaxial leaf cuticle bears dense, short, isodiametric papillae and has two lateral stomatal bands, each of which contains 3-5 short, discontinuous longitudinal rows of stomata. Stomata are longitudinally oriented, amphicyclic. with two polar subsidiary cells and 2-4 lateral subsidiary cells. Each stoma has a more-or-less transversely elongated papillate stomatal ring around the stomatal pit on the outer cuticle surface. Taxus huolingolensis sp. nov. closely resembles leaves of extant Taxus in gross morphology as well as cuticle micromorphology, and within the genus is most similar to the North American species T. brevifolia. Like the leaves of other species of Taxus from the Mesozoic, Taxus huolingolensis sp. nov. has narrower stomatal bands with fewer stomatal rows in each stomatal band compared to the living species of the genus. The discovery of T. huolingolensis adds to our knowledge of Mesozoic Taxaceae and suggests that Taxus has been diverse since the Early Cretaceous. (C) 2022 Elsevier B.V. All rights reserved.