Yellow and grey foliose lichens on weathered bricks

Yellow and grey foliose lichens on weathered bricks

Observation - Yellow and grey foliose lichens on weathered bricks. Description: Yellow and grey foliose lichens on a fairly weathered set of bricks. I'm a little curious as to why the yellow and grey lichens are both growing in the same areas on the right of the wall. Yellow and grey crustose lichen species present too, yellow mostl

Yellow and grey foliose lichens on a fairly weathered set of bricks. I'm a little curious as to why the yellow and grey lichens are both growing in the same areas on the right of the wall.
Yellow and grey crustose lichen species present too, yellow mostly only on side.