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antheridium The male sex organ or gametangium, within which male gametes are formed, in algae, fungi, bryophytes (mosses, liverworts, etc), and pteridophytes (ferns).

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antheridium (pl. antheridia) The male sex organ of algae, fungi, bryophytes, clubmosses, horsetails, and ferns. It produces the male gametes (antherozoids). It may consist of a single cell or it may have a wall that is made up of one or several layers forming a sterile jacket around the developing gametes. Compare archegonium.