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This illustration shows a section of a young antheridial branch: an, antheridia sunken in cavities of the branch, which is also provided with air chambers similar to those of the normal thallus. Some of the antheridia have discharged their gametes, as at x.

Antheridial Branch

This illustration shows a section of a young antheridial branch: an, antheridia sunken in cavities of…

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…