Leimonis erratica is a species of crustose lichen in the family Pilocarpaceae.

A widely distributed species that grows on siliceous rock, it is found in Asia, Australia, North America, and Réunion.

[2] The lichen was originally described in 1861 by German lichenologist Gustav Wilhelm Körber as a member of genus Lecidea.

[3] In 2009, Richard Harris and James Lendemer transferred it to the new genus Leimonis, in which it is the type species.

This Lecanorales-related article is a stub.