Lecidea is a genus of crustose lichens with a carbon-black ring or outer margin (exciple) around the fruiting body disc (apothecium), usually (or always) found growing on (saxicolous) or in (endolithic) rock.

[2]: 298  Lichens that have such a black exciple are called lecideine, meaning "like Lecidea, even if they are not in this genus.

[2]: 14  Members of the genus are commonly called disk lichens or tile lichens.

[2]: 298 According to the Dictionary of the Fungi (10th edition, 2008), the widespread genus contains an estimated 427 species.

This Lecanoromycetes-related article is a stub.