vascular plants are plants that have vessels
Most angiospermic vascular plants have true vessels
Mosses
Xylem vessels are water conducting tubes of the plant
A collective noun for ocean going vessels is a fleet of vessels. A collective noun for drinking vessels is a set of vessels. A collective noun for liquid carrying (in plants and animals) vessels is a system of vessels.
through the xylem vessels
because these are slow growing plants
both have vessels
The xylem tracheids and vessels placed end to end like tubes in plants help in the conduction of water.
Animals and plants are different because animals have one system of vessels and plants have two systems of vessels that aren't connected.
I think it's the Xylem. They absorb water from the roots, and run through the stem. Then, they carry the water in the vessels to the whole plants, and out through the plants through the leaves stomata.
An angioscope is an instrument for examining the capillary vessels of animals and plants.