Massalongia is a genus of lichen-forming fungi in the family Massalongiaceae. It has four species. These lichens form small, leaf-like patches with narrow lobes that often arrange in loose rosettes and produce tiny finger-like projections for vegetative reproduction. They partner with nitrogen-fixing cyanobacteria and are found growing on various surfaces in different climatic regions. The genus was established in 1855 by the German lichenologist Gustav Wilhelm Körber, who named it in honour of the Italian lichenologist Abramo Bartolommeo Massalongo.

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