Zygosperm n. : A spore formed by the union of the contents of two similar cells, either of the same or of distinct individual plants. Zygosperms are found in certain orders of algae and fungi.

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Taxonomy
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Defination from the web:
zygosperm. Definition from Wiktionary, a free dictionary. Jump to: navigation, search ... zygosperm (plural zygosperms) (botany) A spore formed by the union of the contents of two similar cells, either of the same or of distinct individual plants. ...