macrosporangium definition

  • noun:
    • See megasporangium.
    • A sporangium or conceptacle containing only big spores; against microsporangium. Both are observed in the genera Selaginella, Isoetes, and Marsilea, all of which are ferns or remotely allied to ferns.
    • A sporangium or conceptacle containing just large spores; -- opposed to microsporangium. Both are located within the genera Selaginella, Isoctes, and Marsilia, flowers remotely allied to ferns.
    • A sporangium containing macrospores. It is homologous with the ovule of flowering flowers. Also referred to as goniotheca.
    • a plant structure that produces megaspores

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  • Sentence for "macrosporangium"
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