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The Collaborative International Dictionary

Macrosporangium

Macrosporangium \Mac`ro*spo*ran"gi*um\, n. [NL. See Macro-, and Sporangium.] (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.

Wiktionary

macrosporangium

n. (context botany English) A megasporangium; sporangium or conceptacle containing only large spores; opposed to microsporangium.

WordNet

macrosporangium

  1. n. a plant structure that produces megaspores [syn: megasporangium]

  2. [also: macrosporangia (pl)]