bracken clouds England english Great Britain green heath heathland landscape meadow natural nature sky summer Sussex trees conifers apple tree branch host kent mistletoe parasite plant Santalaceae Viscum album animal domesticated ear eye fleece head livestock llama mammal neck white bank Devon ferns fronds plants Pteridophyta shaded shady wild woodland Bedfordshire current flow oxygenate oxygenation river water weir architecture historical mill power rural sails South Downs traditional wind windmill wooden crop Downs farm field golden grain panorama path south track view yellow autumn bush foliage garden leaf leaves shadows shrub stems