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词汇 siphonostele
释义

Definition of siphonostele in English:

siphonostele

nounˈsʌɪf(ə)nəʊstiːl
Botany
  • A stele consisting of a core of pith surrounded by concentric layers of xylem and phloem.

    Example sentencesExamples
    • The thick-walled cells in the center of the core are sometimes considered to be pith, in which case the vascular arrangement would actually be a siphonostele.
    • Other lycophytes have a siphonostele, with a central region of generalized tissue within a cylinder of vascular tissue.
    • Use the three-dimensional diagram to understand how a leaf gap relates to the vascular cylinder of a siphonostele.
    • In anatomical cross section, the stem of Lepidodendron displays an exarch siphonostele surrounded by secondary xylem in ranks.
    • The node cross section of Equisetum looks quite different: the siphonostele is complete and leaf traces emerge from the solid vascular cylinder only at these locations.

Definition of siphonostele in US English:

siphonostele

nounsīˈfänəˌstēl
Botany
  • A stele consisting of a core of pith surrounded by concentric layers of xylem and phloem.

    Example sentencesExamples
    • Other lycophytes have a siphonostele, with a central region of generalized tissue within a cylinder of vascular tissue.
    • The thick-walled cells in the center of the core are sometimes considered to be pith, in which case the vascular arrangement would actually be a siphonostele.
    • In anatomical cross section, the stem of Lepidodendron displays an exarch siphonostele surrounded by secondary xylem in ranks.
    • The node cross section of Equisetum looks quite different: the siphonostele is complete and leaf traces emerge from the solid vascular cylinder only at these locations.
    • Use the three-dimensional diagram to understand how a leaf gap relates to the vascular cylinder of a siphonostele.
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