Moss is a weed in grass lawns, and grass is a weed in where moss dominates.
While mosses often grow on substrates, they never dominate by being parasitic. They are nothing great, but their tiny leaves work hard to absorb water and nutrients, which are in turn converted into food in a photosynthetic factory, a factory that I would like to, but can never visit, or take photographs.
Mosses do not bear flowers and fruits. They are simple, yet aesthetic, and mysterious in a close-up. I can get lost in this "mossy forest" if I am an ant, whilst a real ant can never.
What if I write them as mossssssssssssssss? Does this look like a clump of moss?