Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of microsporangium is as below...

Macrosporangium :: Macrosporangium (n.) 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..

Microsporangium :: Microsporangium (n.) A sporangium or conceptacle containing only very minute spores. Cf. Macrosporangium.

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