biome branch branches bush bushes environmental fern ferns Ferns and horsetails foliage forest green large leaf leaves life nature Ostrich fern plant plants summer Terrestrial plant tree vascular plant vegetation abstract angles appearance backdrop background bracken coloring colors colouring colours cool droplets drops fern-tree flora fronds greenery shade shapes spread spreading sunlight texture textures tree-fern variation wallpaper frond garden tropics Asia common feature epiphytes epiphytic ferns fern species host trees limbs non-parasitic rainforests Roots spores stems trees tropical tropical trees trunks variations variety bridge structure trunk