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The new species Squamarina scopulorum Haugan & Timdal (sect. Petroplaca) is described from Norway. It differs from the sympatric and morphologically closely similar species S. magnussonii and S. pachylepidea mainly in the color of the apothecial disc and in the thallus chemistry. The delimitation of the genus Squamarina and the family Squamarinaceae are briefly discussed.