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AH_Lichen Parmelia saxatilis Peak District Trentepohlia green alga_9830.jpg
Lichen {Parmelia saxatilis} interspersed with  orange patches of a green alga {Trentepohlia sp.} that gets its unusual colouration from the haematochrome (β-carotene) it contains. Found growing on a gritstone boulder in shady woodland, Peak District National Park, Derbyshire, UK. October.