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.
Larval Leaf Scorpionfish (photograph by Chris Newbert, Minden Pictures). Lacking any other defense, many larval fish have adapted transparency as a method of camouflage—such as this tiny, see-through larval leaf scorpionfish in Hawaii.