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a male reproductive structure producing gametes, occurring in ferns, mosses, fungi, and algae.
Historical Examples

Oogonium with the central uninucleate oosphere and the fertilizing tube (a) of the antheridium which introduces the male nucleus.
Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 3 Various

A fruiting portion, magnified, showing the structure; a sporocarp, and an antheridium.
The Elements of Botany Asa Gray

It is remarkable that amongst these fungi the tube projected by the antheridium effects fecundation only by contact.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

Spermatozoids are formed in the antheridium, and these enter the archegonium and fertilize the germ cell.
The Nursery Book Liberty Hyde Bailey

The male plant has no definite stem, and consists of a single concave leaf protecting the antheridium.
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3 Various

These particles become globose cells, grouped in the centre of the antheridium.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

These cells, especially the outer ones, develop a great amount of a red pigment, giving the antheridium its characteristic color.
Elements of Structural and Systematic Botany Douglas Houghton Campbell

It is seldom that more than one antheridium applies itself to an oogonium.
Fungi: Their Nature and Uses Mordecai Cubitt Cooke

antheridium (plural antheridia), the organ in Cryptogams which answers to the anther of Flowering Plants, 150.
The Elements of Botany Asa Gray

The antheridium consists at first of a basal cell and a terminal one.
Elements of Structural and Systematic Botany Douglas Houghton Campbell

noun (pl) -ia (-ɪə)
the male sex organ of algae, fungi, bryophytes, and spore-bearing vascular plants, such as ferns, which produces antherozoids
antheridium
(ān’thə-rĭd’ē-əm)
Plural antheridia (ān’thə-rĭd’ē-ə)
An organ in certain organisms that produces male gametes. Antheridia are found in many groups of organisms, including the bryophytes, ferns, ascomycete fungi, and some algae. Most gymnosperms and all angiosperms, however, have lost the antheridium, and its role is filled by the pollen grain. Compare archegonium.