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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Mac·ro·spo·ran·gi·um n.  Bot. 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.
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From: WordNet (r) 2.0

 macrosporangium
      n : a plant structure that produces megaspores [syn: megasporangium]
      [also: macrosporangia (pl)]