‖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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.