Bryophytes are a diverse group of non-vascular plants, including mosses, liverworts, and hornworts. While they don't have the same "major characters" as, say, humans or animals, they do have key characteristics that define them as bryophytes.

Here are some of the major characteristics of bryophytes:

General Characteristics:

* Non-vascular: They lack a specialized vascular system (xylem and phloem) for transporting water and nutrients. This limits their size and restricts them to moist environments.

* Dominant Gametophyte Generation: The haploid gametophyte is the dominant stage in their life cycle, unlike vascular plants where the sporophyte is dominant. The sporophyte is dependent on the gametophyte for nutrition.

* Lack True Roots, Stems, and Leaves: They have rhizoids, which are root-like structures that anchor them to the substrate but do not absorb water. They also have simple, undifferentiated structures that resemble stems and leaves but lack the complex tissues found in vascular plants.

* Reproduce via Spores: Bryophytes reproduce sexually via spores produced in capsules that develop on the sporophyte.

Specific Characteristics of Each Bryophyte Group:

Mosses:

* Leafy appearance: They are typically characterized by small, leafy structures that grow in dense mats.

* Capsule with a lid: The sporophyte capsule often has a cap called an operculum that falls off to release spores.

* Presence of peristome teeth: The capsule mouth may have teeth called peristome teeth that help disperse spores.

Liverworts:

* Thalloid or leafy: They can be either flat, lobed thalli (thallose liverworts) or have leafy structures (leafy liverworts).

* Gemmae cups: Some liverworts have specialized cups that produce gemmae, small, multicellular structures that can develop into new plants.

* Lack of stomata: They lack specialized pores on their surfaces for gas exchange, relying on diffusion for this process.

Hornworts:

* Horn-shaped sporophyte: They have a long, cylindrical sporophyte that resembles a horn, hence their name.

* Single chloroplast per cell: They have a unique feature of having a single, large chloroplast in each cell.

* Association with cyanobacteria: They often have a symbiotic relationship with cyanobacteria that fix atmospheric nitrogen, providing a valuable source of nitrogen for the plant.

These are the major characteristics that distinguish bryophytes from other plant groups. They are a fascinating and important group of plants, playing crucial roles in ecosystems and serving as models for understanding plant evolution.