the answer is NOT roots. It is called Rhizomes. They are rootlike structures because they can't absorb water.
Rhizoids
archegonium
Nonvascular plants, for instance, the mosses, have root-like structures called rhizoids used to attach themselves to soil, trees, rocks and other structures.
The threadlike structures are called rhizoids.
the roots serve as the anchor of the plant.
plants that do not have tubes
Nonvascular plants have stems
Roots, seeds and true xylem and phloem elements are absent in non-vascular plants.
Because nonvascular plants do not have true leaves
mosses are the largest group of nonvascular plants.
Nonvascular plants dont have xylem and phloem, whereas seed plants have vascular bundles
Because they are nonvascular plants and they don't grow because they are dead