Antheridium

An antheridium is a male gametangium that produces sperm cells in many plants, algae, and fungi. It occurs in the gametophyte generation of plants that retain this structure.

Spermatogenesis: Spermatogenesis is the production and development of sperm cells. Antheridia produce sperm through cell divisions and differentiation.
Gametangium: A gametangium is a multicellular structure in which gametes are produced or housed. Antheridium is the male form of this reproductive structure.
Moss: A moss is a small, nonvascular land plant in the division Bryophyta. Mosses bear conspicuous antheridia on their gametophytes.
Microsporangium: A microsporangium is a structure in seed plants that produces microspores, which develop into male gametophytes. Unlike antheridia, it produces spores rather than sperm cells directly.
Antherozoid: An antherozoid is a motile sperm cell produced by certain plants, algae, and fungi. It is the flagellated sperm released by many antheridia.
Gametophyte: A gametophyte is the haploid generation of a plant life cycle that produces gametes. Antheridia develop on the gametophyte in plants that possess them.
Liverwort: A liverwort is a nonvascular land plant in the division Marchantiophyta. Many liverworts form antheridia in specialized structures or chambers.
Pollen grain: A pollen grain is the reduced male gametophyte of seed plants, carrying cells involved in fertilization. Seed plants use pollen instead of free-living antheridia to deliver male gametes.
Archegonium: An archegonium is a multicellular female gametangium that produces or contains an egg cell. Sperm from antheridia may swim to this female reproductive structure.
Alternation of generations: Alternation of generations is a life cycle alternating between multicellular haploid and diploid stages. Antheridia belong to the gamete-producing stage of this cycle.

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