The Gomphillaceae are a family of mostly lichen-forming fungi in the order Graphidales. Species in this family are found mostly in tropical regions. The family is particularly well-adapted to tropical environments, where many species grow directly on leaves in humid rainforests. The family underwent a major molecular phylogenetics-led reorganisation in 2023, in which 17 genera were recognised and formally established as new or reinstated. The family contains over 800 species organised into approximately 46 genera. Many members of this family reproduce through specialised structures and lack the lichen products typically found in other lichen groups.

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