Abstract
The saxicolous lichen species, Caloplaca allochroa, is described as new from subtropical inland localities of Gangwon and Jeollanam Province (South Korea). It is characterized by occurring as two colour variants, yellowish and gray, based on presence vs. absence of anthraquinone pigments. Its colour contrast between brownish-red to brownishblack apothecial disc and yellowish-orange apothecial margin is very characteristic. Further diagnostic characters are a hymenium with numerous oil-drops and specific ecology. The species is related to Caloplaca flavorubescens and C. flavovirescens.
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