A fern is any one of a group of about 12,000 species of plants belonging to the botanical group known as Pteridophyta. Unlike mosses, they have xylem and phloem (making them vascular plants). They have stems, leaves, and roots like other vascular plants. Ferns reproduce via spores (as shown here on the back of the leaf) and have neither seeds nor flowers.
Spores on the underside of fern leaf
Nature's coloring book