What is an example of archegonium?

archegonium, the female reproductive organ in ferns and mosses. An archegonium also occurs in some gymnosperms, e.g., cycads and conifers. A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base—the venter—which contains the egg.

What is the difference between Oogonium and archegonium?

Oogonium is the female reproductive organ of certain algae and fungi. On the other hand, archegonium is the female reproductive organ of mosses, ferns and even some gymnosperms.

What are antheridia and archegonia?

Antheridia is the male sex organ and archegonia are the female sex organ mainly in cryptogams. Antheridia produces male gametes called antherozoids or sperms, whereas archegonia produce female gametes or eggs.

Do bryophytes have archegonia?

Bryophytes and gymnosperm have archegonia(plural form). Pteridophytes have also archegonium but are highly reduced.

What is oogonium?

The very small egg (oogonium) has the character of a simple cell. It is formed of a mass of naked protoplasm, containing a nucleus within which there is a nucleolus. The nucleus and nucleolus are usually termed germinal vesicle and germinal spot. This oogonium is developed either from:

What is the structure of the archegonium?

A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base—the venter—which contains the egg. Neck-canal cells, located above the egg, disappear as the archegonium matures, thus producing a passage for entry of the sperm. The sperm are produced in the corresponding male reproductive organ,…

How many gametes are in the archegonium?

The egg-producing organ, the archegonium, contains one gamete (sex cell), which is always located in the lower, more or less dilated portion of the archegonium, the venter. The upper part of the archegonium, the neck, consists of four rows of cells containing central neck cells.

What is the structure at the base of the oogonium called?

At the base of the oogonium is a funnel-shaped structure interpreted as the antheridium. Intracellular peronosporomycetes ( Combresomyces cornifer) in lycopod periderm have also been described and illustrated from the upper Visean cherts of central France (Krings et al., 2007e; Dotzler et al., 2008).