Bryocaulon is a small genus of lichen-forming fungi in the family Parmeliaceae. The genus has a widespread distribution in north temperate regions, and contains four species. These lichens form shrub-like tufts with cylindrical branches that are covered in tiny white pores for gas exchange. They are found mainly in cold regions of the Northern Hemisphere, particularly in arctic and mountainous areas where they grow on acidic bark and rocks.

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