Erik Acharius (October 10, 1757 – August 14, 1819), Swedish botanist and lichenologist, and one of Carolus Linnaeus last pupils. Acharius made the first detailed classification system for lichens, and is sometimes called "the father of lichenology".
Author abbreviation: Ach.
- 3 taxon names authored by Erik Acharius (May be incomplete)
- Acharius, E. 1814. Synopsis Methodica Lichenum.: 1–392. Mattick Rec.# 30923 – Recent Literature on Lichens RLL Reference page.
- Uppsala University, 2008: The secret of lichens was concealed from Linnaeus