Mosses are non-vascular plants that are embryophytes. They do not have flowers or produce seeds; instead, they reproduce via spores. Mosses typically range from a few millimeters to a few centimeters in height and generally prefer moist environments with low to moderate light. They grow on surfaces like soil, rocks, tree trunks, or even steps. Popular moss species include Polytrichum (haircap moss), Bryum (common moss), Hypnum (feather moss), and Leucobryum (white moss).