Archegonia and antheridia mature at different times
Such a situation might be viewed as evidence for the antithetic theory and parallels the life history in modern bryophytes, where the sporophyte phase is permanently parasitic on the gametophyte. Its lacy foliage is pretty, but the plant is a pain and difficult to remove. We will examine Marchantia, in which the gametophytic thallus grows as a large, flat photosynthetic structure on the surface of the ground. Observe the living moss on display. This is referred to as a haploid , or half DNA phase. Inside the cups are lens-shaped outgrowths known as gemmae which are splash out the cup by rain.
The reproductive structure that produces male gametes. What do antheridia produce? It is advantageous for the antheridia and archegonia to be locatedon the ventral aspect of the fern. The prothallus is anchored to the soil by rhizoids. In seedless plants, fungi, and algae it produces sperm.
It is the principle of gravity. What is the function of an Antheridia? In seedless plants, fungi, and algae it produces sperm. This keeps the genetalia closestto the rhizomes.
For example, in the Australian National Botanic Gardens in Canberra, there is a deep gully that is full of tree ferns and many other varieties of fern. The result is that during meiosis, the homologous chromosomes cannot match up because they are somewhat dissimilar. A related species grows as an epiphyte on the date palm trunks near the Conservatory. If you want a fern to grow, you have to come to the party by creating an environment similar to the one it has evolved to live in. Modern ferns are descended from some of the oldest plants on Earth. Science Biology Botany Plants week 4, nonvascular and vascualr seedless plants advertisement.