Arthrorhaphis is a genus of fungi in the monotypic family Arthrorhaphidaceae. It has 13 species. Species in this family have a widespread distribution in temperate and montane habitats. They grow symbiotically with green algae, or parasitically on other lichens. These fungi typically start as parasites on other lichens but can later become free-living, forming bright greenish-yellow to greyish scales on acidic soils and weathered rocks in cool upland regions.

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