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The plant kingdom is both fundamental and diverse. From ferns to mosses to gigantic trees, it’s all there. With little to no effort, we can frequently observe them evolve. The Plantae kingdom is divided into five groups: angiosperms (flowering plants), gymnosperms (non-flowering plants), thallophytes, Bryophytes, and pteridophytes. They have a pigment called chlorophyll that gives plants their green colour, and they produce their own food through photosynthesis, making them autotrophs. Bryophytes are non-vascular, microscopic plants that include hornworts, liverworts, and mosses. Bryon, which means moss, and python, which means plant, are combined to form their name.
Bryophytes have the following characteristics:
- The plant body is thallus-like, i.e. prostrate or upright;
- It is linked to the substratum by rhizoids, which are unicellular or multicellular;
- They lack genuine vegetative structure and have a root-like, stem-like, and leaf-like structure; (xylem, phloem)
- The thalloid gametophyte is split into rhizoids, axis, and leaves;
- The gametophyte is photosynthetic and possesses multicellular sex organs;
- The antheridium produces biflagellate antherozoids.
- The archegonium is flask-shaped and only produces one egg.
- The antherozoids and the egg unite to form a zygote, which then grows into a multicellular sporophyte that is semi-parasitic and feeds on the gametophyte.
- Sporophyte cells go through meiosis to produce haploid gametes, which are then combined to form a gametophyte.
- Sporophyte cells are developed into foot, seta, and capsule • Protonema is the juvenile gametophyte
Habitat
It is possible to find bryophytes in a range of environments. They thrive in a broad range of temperatures (cold arctic to scorching deserts), elevations (sea-level to alpine), and moisture levels (sea-level to alpine) (dry deserts to wet rain forests). Bryophytes can grow where vascularized plants can’t since they don’t rely on roots for nutrition. Both rocks and soil are suitable habitats for bryophytes.
Classification
Bryophyta is split into three classes:
- Hepaticopsida (Liverworts)
- Anthocerotopsida (Hornworts)
- Bryopsida (Mosses)
- Hepaticopsida (Liverworts) The word “hepatic” means “liver,” hence the term Hepaticopsida means “liverworts.” Liverworts are included in this category. Liverworts, which are a kind of bryophyte, are included in this group. It has almost 900 species. The most primitive bryophytes are liverworts. They like living near wet rocks and soil. Because they dwell near water, they have a far lesser chance of drying out.
A gametophyte is a plant that is a kind of gametophyte. It can be thalloid (flat) or ribbon-like, and it is frequently dichotomously branched (ribbon-like). Marchantia, for example, is connected to the soil through rhizoids. Other species, such as Porella, grow erect and appear to be leafy, with a phoney stem and leaves. The gametophyte nourishes and protects the sporophyte. The sex organs develop at the branch termini on the upper surface of the thallus. They, like Marchantia, may grow distinct branches on gametophytes called antheridiophores and archegoniophores.
- Anthocerotopsida (Hornworts): There are around 300 species in this class. The common term for them is hornworts. It is the only member of the Anthocerotales order. Examples include Anthoceros, Megaceros, and Notothylas. This bryophyte clade is slightly more advanced than Bryopsida and Hepaticopsida in some regions. From a distance, the gametophyte seems lobed and uneven. The sporophyte is not reliant on the gametophyte for sustenance or protection, except in the early stages of development. Antheridia and archegonia are partially surrounded by gametophytic tissue.
- Bryopsida (Mosses): There are around 1400 species in the Bryophyta class. Mosses is a common moniker for them. Mosses, like liverworts, like damp environments. They survive in relatively dry environments, unlike other bryophytes. Mosses, on the other hand, need water to reproduce, which is why they often create cushions or mats. Examples include Funaria, Polytrichum, and Sphagnum.
Examples
The bryophyte family includes around 20,000 plant species. The three kinds of bryophytes are liverworts, mosses, and hornworts. Listed below are a few examples:
Liverworts : Marchantia, Riccia, Pellia, Porella, Sphaerocarpos, and Calobryum.
Mosses : Funaria, Polytrichum, and Sphagnum.
Hornworts : Anthoceros, Notothylas, and Megaceros.
Amphibians of Plants
Because bryophytes are terrestrial plants that require water to complete their life cycle during sexual reproduction, they are known as “plant amphibians.”
Conclusion
Bryophytes is a proposed taxonomic class that contains non-vascular terrestrial plants such as liverworts, hornworts, and mosses (embryophytes). They are usually tiny and favour wet environments, although they may also flourish in drier ones. The bryophytes are a group of over 20,000 plant species. Bryophytes, with encased reproductive parts, do not blossom or reproduce (gametangia and sporangia). They proliferate both sexually and asexually via spores and fragmentation or gemma production. Though bryophytes were originally assumed to be a paraphyletic group, nearly all current phylogenetic evidence now supports Wilhelm Schimper’s 1879 definition of monophyly.
