Tundra vegetation is composed of dwarf shrubs, sedges and grasses, mosses, and lichens. These include perennial grasses, sedges, forbs, cushion plants, mosses, and lichens. Many orchids, bromeliads, ferns and mosses often grow as epiphytes. These woodlands are home to lichens, mosses and ferns. Flora of mosses and lichens are very diverse. It is home to exceptional epiphytic mosses, liverworts and lichens. Marmots mainly eat greens and many types of grasses, berries, lichens, mosses, roots, and flowers. Tardigrades are often found on lichens and mosses. Other plants found include ferns, horsetails, club mosses, and conifers. Bouldering can damage vegetation that grows on rocks, such as mosses and lichens. Extensive swamps developed with mosses, ferns, horsetails and calamites. Lichens produce allelopathic chemicals that inhibit the growth of mosses. There are many species of ferns, flowers, fungi, and mosses. They include mosses, liverworts and hornworts. It is composed mainly of wetland vegetation&colon; principally bog plants including mosses, sedges, and shrubs.