Macrosporangium
Pronunciation : Mac`ro*spo*ran"gi*um
Part of Speech : n.
Etymology : [NL. See Macro-, and Sporangium.] (Bot.)
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913