Lichen: Candelariella aurella | Nature Notes from Dorset

Here is a common sight on brick buildings; both walls and roofing tiles (and even roofing felt), Candelariella aurella. This is a mustard coloured foliose lichen that grows outwards in a oval shape, gradually expanding in size as it developes. Once it gets established those dish-shaped discs appear which are the fruiting bodies from which the tiniest of spores are released.
It does no harm to its substrate (or the building in general) but it is tempting to clean it off which is a shame as it is easy to forget it is a living organism 

Read more: Lichen: Candelariella aurella | Nature Notes from Dorset

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