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An illustration of the anteridium of a bracken. An antheridium (plural: antheridia) is a haploid structure or organ producing and containing male gametes (called antherozoids or sperm). Brackens (Pteridium) are a genus of about ten species of large, coarse ferns, in the family Dennstaedtiaceae. The genus has probably the widest distribution of any fern genus in the world, being found on all continents except Antarctica and in all environments except for hot and cold deserts. Therefore it is considered to have a cosmopolitan distribution.

Antheridium of Bracken

An illustration of the anteridium of a bracken. An antheridium (plural: antheridia) is a haploid structure…

Antheridium of Chara: a, The four upper shields; b, interior; c, antheridial filament; d, two antherozoids.

Antheridium of Chara

Antheridium of Chara: a, The four upper shields; b, interior; c, antheridial filament; d, two antherozoids.

The Antheridium is the male organ of plants. Within it are produced the sperms or their equivalents, which fertilize the female cells or eggs.

Section through Antheridium of Liverwort

The Antheridium is the male organ of plants. Within it are produced the sperms or their equivalents,…

"1. Spore-case of Lycopodium denticulatum opened; 2. antheridium; 3. spore." -Lindley, 1853

Ground Pine

"1. Spore-case of Lycopodium denticulatum opened; 2. antheridium; 3. spore." -Lindley, 1853