Xanthoria parietina

    Description

    A yellowy orange coloured leafy lichen that is one of the most common species around. The yellow chemical xanthorin is thought to be produced as a defence against UV radiation to which it is exposed in its normal habitat - cement tiled roofs, exposed twigs and branches etc. When it is growing in the shade it does not require such protection and xanthorin production stops and the lichen remains green. In or after rain, this lichen appears more greeny yellow as the algae shows through the more translucent fungus.

    Photo ID?
    Habitat

    On rocks, cement, tiled roofs and tree bark, particularly where bird droppings fall.

    When to see it

    All year round

    Life History

    Xanthoria parietina is a very pollution-tolerant species. Nutrient enrichment by bird droppings enhances the ability of X. parietina to grow on rock.

    UK Status

    Very common and widespread

    VC55 Status

    Very common in Leicestershire and Rutland.

    Leicestershire & Rutland Map

    UK Map