A structure in which spores are produced. One unbranched bryophyte sporophyte bears a single sporangium; branching sporophytes can distribute several sporangia on one body.
A microsporangium is a sporangium in which microspores are produced. In a heterosporous plant, those microspores develop into male gametophytes; production of sperm is a later step.
In a flowering plant, the anther contains microsporangia. Distinguishing the enclosing structure, the microspore and the mature pollen grain prevents several different developmental stages from being treated as synonyms.
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