A new species of osmundaceous fern rhizome, Ashicaulis macromedullosus sp. nov., from the Middle Jurassic, northern China
スポンサーリンク
概要
- 論文の詳細を見る
Ashicaulis macromedullosus sp. nov. (Osmundaceae) is described on the basis of one silicified rhizome, collected from the Middle Jurassic Tiaojishan Formation in Hebei, China. This specimen consists of a small, upright stem surrounded by frond bases, and adventitious roots. The stem consists of pith, xylem cylinder, a two-layered cortex and petiole bases. In cross section, the stem has a dictyoxylic xylem cylinder composed of 24-32 xylem strands separated by many leaf gaps with some incomplete leaf gaps. This species is characterized by continuous cylindrical phloem, absence of medullary traces in the pith, no sclerenchyma in leaf trace concavity, homogeneous cortical sclerenchyma, and one mass of sclerenchyma in each stipular wing. This is the third structurally preserved rhizome of Ashicaulis from the Mesozoic in northern China and adds to the knowledge of fern diversity in China. Northern Hemisphere species from the Jurassic have a tendency to larger stele diameter than comparable Mesozoic species in the Southern Hemisphere.
- 日本古生物学会の論文
- 2006-09-30
著者
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Matsumoto Midori
Department Of Biosciences And Informatics Faculty Of Science And Technology Keio University
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Matsumoto Midori
Department Of Earth Sciences Faculty Of Science Chiba University
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Matsumoto Midori
Department Of Anesthesia Federation Of National Public Service Personnel Mutual Aid Associations Tac
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ZHANG WU
Shenyang Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences
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ZHENG SHAOLIN
Shenyang Institute of Geology and Mineral Resources, Chinese Academy of Geological Sciences
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WANG YONG-DONG
Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences
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Zhang Wu
Shenyang Institute Of Geology And Mineral Resources Chinese Academy Of Geological Sciences
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Zheng Shaolin
Shenyang Institute Of Geology And Mineral Resources Chinese Academy Of Geological Sciences
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Wang Yong-dong
Nanjing Institute Of Geology And Palaeontology Chinese Academy Of Sciences
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Saiki Ken'ichi
Natural History Museum And Institute
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Zheng ShaoLin
Shenyang Center of China Geological Survey, Shenyang Institute of Geology and Mineral Resources:Institute of Palaeontology, Shenyang Normal University
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Zhang Wu
Shenyang Center of China Geological Survey, Shenyang Institute of Geology and Mineral Resources
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