Allographa leptospora

About

Allographa leptospora is a species of script lichen in the family Graphidaceae. It is characterized by its whitish thallus and distinctive reproductive structures with parallel striations. First described in 1921 by the Finnish lichenologist Edvard August Vainio as Graphis leptospora based on specimens collected from Thailand, the species was later reclassified into the genus Allographa in 2018. This predominantly tropical lichen contains norstictic acid, producing a yellow-to-red chemical reaction when tested. Though historically known only from tropical regions, it was discovered in Portugal in 2016—its first documented occurrence in Europe—where it grows in oak forests at various elevations. Its appearance in Europe may be linked to climate change creating favourable conditions for tropical species to establish in certain European microclimates.

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