Definitions for antheridiumˌæn θəˈrɪd i əm; -θəˈrɪd i ə
This page provides all possible meanings and translations of the word antheridium
the male sex organ of spore-producing plants; produces antherozoids; equivalent to the anther in flowers
An organ producing male gametes called antherozoids, found in lower plants.
the male reproductive apparatus in the lower, consisting of a cell or other cavity in which spermatozoids are produced; -- called also spermary
Origin: [Anther + (a Gr. diminutive ending).]
An antheridium or antherida is a haploid structure or organ producing and containing male gametes. It is present in the gametophyte phase of cryptogams like bryophytes and ferns, and also in the primitive vascular psilotophytes. Many algae and some fungi, for example ascomycetes and water moulds, also have antheridia during their reproductive stages. An antheridium typically consists of sterile cells and spermatogenous tissue. The sterile cells may form a central support structure or surround the spermatogenous tissue as a protective jacket. The spermatogenous cells give rise to spermatids via mitotic cell division. In bryophytes, the antheridium is borne on an antheridiophore, a stalk-like structure that carries the antheridium at its apex. In many gymnosperms and all angiosperms, the male gametophytes have been reduced to pollen grains and their antheridia have been reduced to a single generative cell within the pollen grain. During pollination, this generative cell divides and gives rise to two sperm nuclei. The female counterpart to the antheridium is the archegonium.
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