Crustose lichen on concrete

Crustose lichen on concrete

Observation - Crustose lichen on concrete. Description: Large patches of grey, crustose lichen with small cup-like ?fruiting bodies which seem greyish in the centre on the sloping concrete top of an old bridge. This was south-facing and very exposed. The lichen seems not to grow over the small embedded bits of

Large patches of grey, crustose lichen with small cup-like ?fruiting bodies which seem greyish in the centre on the sloping concrete top of an old bridge. This was south-facing and very exposed. The lichen seems not to grow over the small embedded bits of flint.