A prothallium, or prothallus (from Latin pro = forwards and Greek θαλλος (thallos) = twig) is usually the gametophyte stage in the life of a fern or other pteridophyte. Occasionally the term is also used to describe the young gametophyte of a liverwort or peat moss as well. The prothallium develops from a germinating spore. A gametophyte (/ ɡ ə ˈ m iː t oʊ f aɪ t /) is one of the two alternating phases in the life cycle of plants and algae. It is a haploid multicellular organism that develops from a haploid spore that has one set of chromosomes. The gametophyte is the sexual phase in the life cycle of plants and algae.
The fern life cycle requires two generations of plants to complete itself. Each spore grows into a photosynthetic prothallus (gametophyte) via mitosis. Because mitosis maintains the number of chromosomes, each cell in the prothallus is haploid. It appeared as though adult ferns arose from spores. In a sense, this is true, but the tiny. The spores, from the sori, land on damp soil or rockes. Then then grow into small green, heart-shaped gametophyte plants called prothallus. The prothallus can make its own food and absorb water and nutrients from the soil. The prothallus has both male and female reproductive cells and water is needed to bring them together.
A fern gametophyte is called a prothallus. Prothallus is haploid, multicellular gametophyte. The prothallus is heart-shaped and has the archegonia and/or antheridia in the center of the heart, on the surface. The benefits to a seed is being able to have an offspring develop away from the adult and not compete for resources. What is a. Prothallium, the small, green, heart-shaped structure (gametophyte) of a fern that produces both male and female sex cells (gametes). The prothallium forms from a spore. After fertilization, a young sporophyte plant develops; it consists of a primary root, primary leaf, the rudiment of a new stem.