Golden shield lichen ( Xanthoria parietina )


yellow lichen

Structure

A lichen is formed of two or more organisms,a fungus which forms the body of the lichen which

in Xanthoria parietina consists of flattened spreading leaf-like lobes,
and a green chlorococcoid alga which provides the nutrients for the fungus through photosynthesis.

Taxonomy

Xanthoria parietina belongs in the family Teloschistaceae which consist mainly of brightly coloured
lichens that contain a compound that acts as both a sunscreen for the algal partner
and also protects them from harmful UV rays.

Hence Xanthoria is often found in sunny exposed places.

More info on : Natural History Museum

http://www.nhm.ac.uk/nature-online/species-of-the-day/biodiversity/climate-change/xanthoria-parietina/taxonomy/index.html

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