Weathered bricks with lichens, rough bricks without

Weathered bricks with lichens, rough bricks without

Observation - Weathered bricks with lichens, rough bricks without. Description: Yellow and grey foliose lichens present on the weathered bricks at the top of the wall. These two species frequently occur in the same conditions but one does not often dominate. Some of the foliose species are more creamy than the rest of the grey lichen

Yellow and grey foliose lichens present on the weathered bricks at the top of the wall. These two species frequently occur in the same conditions but one does not often dominate. Some of the foliose species are more creamy than the rest of the grey lichen and may be different.
There may be a little pf a crustose species on the side of the wall too.