autumn brown covered dead dry floor forest leaf leaves texture tree trees trunks wood woodland bracken dense England english fern Great Britain green habitat natural nature Pteridium aquilinum summer Surrey beech Fagus path path through the woods shadow spring sunlight track trunk Betula birch cascade current flow moss norway norwegian pour pure quality rivulet rock stone stream water bridleway countryside deciduous footpath peaceful ride Sussex trail tranquil walk exercise rural shade slope steps travel fresh lane road blue bluebell bulb carpet display Endymion non-scriptum flower wild