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单词 microphyll
释义

Definition of microphyll in English:

microphyll

noun ˈmʌɪkrə(ʊ)fɪl
Botany
  • A very short leaf, such as in a moss or clubmoss, with a single unbranched vein and no leaf gaps in the stele.

    Example sentencesExamples
    • Many groups (Lycopodiaceae is an exception) have a ligule or small flap of tissue adaxially above each microphyll, or its homologous sporophyll.
    • The extension of the vascular system into the flaps of tissue creates a true leaf, in this case a microphyll.
    • Are the leaves microphylls as in lycopsids or megaphylls?
    • The microphyll has only a single unbranched strand of vascular tissue, or vein, whereas megaphylls, found in other plants with leaves, have multiple veins, usually branching one or more times within the leaf.
    • The only lineage that has survived is the horsetails, which are herbaceous and share characters with their extinct progenitors such as articulate stems with microphylls arranged in whorls.
 
 
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更新时间:2025/2/7 18:30:39