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macrosporangium

Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. See megasporangium.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A sporangium or conceptacle containing only large spores; opposed to microsporangium. Both are found in the genera Selaginella, Isoetes, and Marsilea, all of which are ferns or remotely allied to ferns.

from the GNU version of the Collaborative International Dictionary of English

  • n. A sporangium or conceptacle containing only large spores; -- opposed to microsporangium. Both are found in the genera Selaginella, Isoctes, and Marsilia, plants remotely allied to ferns.

from The Century Dictionary and Cyclopedia

  • n. A sporangium containing macrospores. It is homologous with the ovule of flowering plants. Also called goniotheca.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a plant structure that produces megaspores

Etymologies

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