Macrosporangium

n.

1.

(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.

Noun

1.

macrosporangium - a plant structure that produces megaspores Synonyms: megasporangium

megasporangium, sporangium, spore case, spore sac