This name derives from the Germanic and Celtic “*hrati- > raith > rhedyn”, meaning “fern (having feathery fronds)”. 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 and have neither seeds nor flowers. The plant's ability to appear as if from nothing accounts for the ancient belief that fern seeds conferred invisibility.