Bryophyta is derived from the Greek words ‘Bryon’ which means moss and ‘Phuton’ which means plants. Embryophytes such as mosses, hornworts, and liverworts belong to the Bryophyta family. These are tiny plants that thrive in shaded and moist environments. They are devoid of vascular tissues. Instead of flowers and seeds, they reproduce through spores. Despite the fact that most bryophytes lack intricate tissue organisation, they come in a variety of shapes and sizes, and they have a diverse ecosystem. They can be found all over the world and are modest compared to most seed-bearing plants. Bryology is the scientific study of bryophytes.
According to the newest classification, Bryophyta is split into three classes:
Hepaticopsida gets its name from the word “hepatic,” which means “liver.” This category includes liverworts. This group includes liverworts, which are a form of bryophyte. It is home to over 900 species. Liverworts are the most basic bryophytes. They prefer to live in moist rocks and wet soil. They have a significantly lower likelihood of drying because they live near water.
A plant called a gametophyte is a form of gametophyte. It is often dichotomously branched and can be thalloid (flat) or ribbon-like (ribbon-like). Rhizoids, for example, connect Marchantia to the soil. Other species, such as Porella, grow upright and are deceptively leafy, meaning they have a phoney stem and leaves. The sporophyte is nourished and protected by the gametophyte. On the upper surface of the thallus, the sex organs form at the terminals of the branches. They sometimes develop different branches on gametophytes termed antheridiophores and archegoniophores, just like Marchantia.
Hepaticopsida is Further Divided into 4 Orders:
The Main Characteristics of the Class Hepaticopsida are:
It occurs as a result of the development of gemmae or the fragmentation process. Inside gemma cups, gemmae are formed. Gemmae are multicellular and asexual organisms that are green in colour. After separating from the parent plant, the gemma cup grows into a new plant.
On the same or distinct thalli, antheridium (male organ) and archegonium (female organ) may be present. They are responsible for the production of sperm and eggs, respectively. The zygote is generated after fertilisation. The zygote matures into a diploid sporophyte, from which a few cells undergo meiosis to produce haploid spores. These spores develop into free-living, photosynthetic haploid gametophytes.
During this class, approximately 300 species are present. Hornworts are the common name for them. Anthocerotales is the sole order it belongs to. Anthoceros, Megaceros, and Notothylas are among examples. In various areas, this bryophyte clade is slightly more advanced than Bryopsida and Hepaticopsida. The gametophyte is lobed and irregular from a broad perspective. Except in the early stages of growth, the sporophyte is not dependant on the gametophyte for sustenance or protection. Antheridia and archegonia are partially immersed in the gametophytic tissue.
The Main Features are:
The process of thallus fragmentation and tuber formation under unfavourable conditions are used for vegetative propagation.
They reproduce sexually by using watery sperm that moves from antheridium to archegonium to procreate. A sporophyte develops from a fertilised egg. The Sporophyte divides longitudinally, releasing spores that develop into gametophytes.
This is a large Bryophyta class with around 1400 species. Mosses is a common name for them. Most mosses, like liverworts, like moist conditions. Unlike other bryophytes, they thrive in moderately dry settings. Mosses, on the other hand, require water to reproduce, which is why they frequently form cushions or mats. Funaria, Polytrichum, and Sphagnum are some examples.
Bryopsida is Further Divided Into 5 Classes:
The Main Features are:
Budding and fragmentation of the secondary protonema are used for asexual reproduction.
Antheridia and archegonia are found at the apical section of leafy stems for sexual reproduction. Sporophyte, which is more distinct than liverworts, is generated after fertilisation. The spores give rise to the gametophyte.
Embryophytes such as mosses, hornworts, and liverworts belong to the Bryophyta family. These are tiny plants that thrive in gloomy, moist environments. They are devoid of vascular tissues. They don’t generate flowers or seeds, instead relying on spores to proliferate. Bryology is the scientific study of bryophytes. Because they are terrestrial plants that require water to complete their life cycle at the time of sexual reproduction, bryophytes are known as “plant amphibians.”
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