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Pseudoschismatomma

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Pseudoschismatomma is a monotypic fungal genus in the family Roccellaceae. It contains the single species Pseudoschismatomma rufescens, a corticolous (bark-dwelling), crustose lichen. The species was originally described in 1794 but was reclassified into its own genus in 2014 following DNA analysis that revealed it was distinct from similar-looking lichens. This inconspicuous lichen forms a very thin, olive to reddish-brown crust on tree bark and is easily overlooked due to its paint-like appearance that blends closely with its substrate. It is known from temperate Europe, with confirmed records from Belgium, though it probably occurs more widely in the region on the bark of broad-leaved trees in humid woodland and parkland settings.