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单词 prothallus
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Examples ofprothallus

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If conditions are right, a spore will germinate and grow into a rather inconspicuous plant body called aprothallus.
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Theprothallusis red to whitish in the inner part, red the in outer part.
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This eventually results in the formation of a notch at the anterior edge of theprothallus, giving it a roughly heart-shaped appearance (cordate).
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The haploidprothallusdoes not resemble the sporophyte, and as such ferns and their allies have a heteromorphic alternation of generations.
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One of the cells at the top margin of theprothallusthen divides obliquely when it has 5, 10, or more cells across its width.
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Young fern sporelings can often be found with theprothallusgametophyte still attached at the base of their fronds.
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The gametophyte of some non-thallophyte plants -- clubmosses, horsetails, and ferns is termedprothallus.
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Rhizoids anchor theprothallusto the soil.
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These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.

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更新时间:2025/8/17 19:47:40