The Ramalinaceae are a family of lichen-forming fungi in the order Lecanorales. First proposed by Carl Adolph Agardh in 1821, the family now comprises 71 genera and more than 1200 species. Ramalinaceae lichens exhibit diverse growth forms, including crustose, fruticose, squamulose, leprose, and byssoid thalli, and form symbiotic relationships primarily with green algae of the genus Trebouxia. The family is characterised by pale-coloured thalli, apothecia (fruiting bodies) that are typically pale but may darken with age, and ascospores that vary in shape and septation.

Members of the Ramalinaceae are found in a wide range of habitats worldwide, from coastal fog deserts to boreal, temperate, and tropical forests. Some genera, such as Namibialina, Vermilacinia, and Niebla, are endemic to specific coastal desert regions, whilst others like Ramalina have an almost worldwide distribution. Several species within the family face conservation challenges due to their limited distributions and specific environmental threats, with some being listed as vulnerable or critically endangered on the IUCN Red List.

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