Asia branches common feature epiphytes epiphytic ferns fern species ferns host trees leaves limbs non-parasitic rainforests Roots spores stems trees tropical tropical trees trunks variations variety bridge bush fern forest leaf structure tree trunk abstract angles appearance backdrop background bracken coloring colors colouring colours cool droplets drops fern-tree flora foliage fronds green greenery shade shapes spread spreading sunlight texture textures tree-fern variation vegetation wallpaper alpine beautiful conservation ecology environment lush moss mountain nature rocks stream undergrowth water Australia bushland fern tree native flora refreshing shadows tree fern landscape loch lomond national park rivulet scenery scotland summer