Naked seeded plants with vascular tissues are known as gymnosperms. Gymnosperms are a group of plants that produce seeds that are not enclosed in a protective fruit. They are distinct from other plant groups such as bryophytes (mosses), pteridophytes (ferns), and angiosperms (flowering plants). Gymnosperms are often considered a fossil group because they have a long evolutionary history and many of their ancestors are now extinct.

Gymnosperms have several distinguishing features that set them apart from other plant groups:

1. Naked Seeds: Gymnosperms produce seeds that are not enclosed within a fruit. Instead, the seeds are usually borne on the surface of specialized structures like cones or scales. This is in contrast to angiosperms, which have seeds enclosed within fruits.

2. Vascular Tissues: Gymnosperms have well-developed vascular tissues, which consist of xylem and phloem. Xylem transports water and minerals from the roots to the rest of the plant, while phloem transports sugars and other organic compounds throughout the plant.

3. Cones: Gymnosperms typically produce cones as their reproductive structures. Male cones produce pollen, which is transferred to female cones for fertilization. Female cones then develop seeds.

4. Adaptation to Cold and Dry Environments: Many gymnosperms are adapted to survive in cold and dry environments. They often have needle-like leaves, which reduce water loss through transpiration. Additionally, they can tolerate low temperatures and can photosynthesize even in cold conditions.

Gymnosperms include several well-known plant groups, such as conifers (pine, spruce, fir), cycads, ginkgoes, and gnetophytes. They are found in a wide range of habitats, from tropical rainforests to temperate forests and even in the Arctic tundra.

In conclusion, gymnosperms are a group of plants that have naked seeds, vascular tissues, and reproductive structures in the form of cones. They are often considered a fossil group due to their long evolutionary history and the presence of many extinct species.