Places in Lancing for Lichen

Some of the best places in Lancing for Lichen appears to be on the old mortared flint walls.
The cemetary in North Lancing has endured the efforts of family historians or sometimes undertakers to clean the headstones of the normally familiar Lichens. This is done to preserve the legibiliy of the inscriptions but it is not good news for one of the traditional habitats of this symbiotic pairing of algae and fungi.
A flint wall surrounds much of St James the Less churchyard and clusters of Lichen can be found where the wall has been undisturbed for a long period. In other places the flint and mortar wall is relatively clean. It is not clear why this is so but if Ivy has been removed from those places there has not been sufficient time for Lichen to colonise the space.