A script lichen, or graphid lichen, is a member of a group of lichens which have spore producing structures that look like writing on the lichen body.
[1] The structures are elongated and narrow apothecia called lirellae, which look like short scribbles on the thallus.
[1] "Graphid" is derived from Greek for "writing".
An example is Graphis mucronata.
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