Fringes

Cow parsley is not the only way that nature chooses to fringe the paths. That flower is more often found in less shady parts. In the woods ferns are appropriate combined with dead leaves swept to the sides.
Lush grasses with bluebells do the job pretty well too.
Bilberry is a feature of the birch woods on Blacka, providing a rich and thriving underlayer though less well endowed with flowers and fruit than when out in the open. It can be a challenge to the adventurous off-track walker and his ankles when it covers boulders.