81 - [Botany] [Lichenology] ACHARIUS (Erik). Synopsis methodica lichenum, containing all the plants of this natural order that have been discovered, which he arranged according to genera, species, and varieties; defined them with corrected characteristics and distinctions; and illustrated with selected synonyms and observations. Lund, Svanborg and Co., 1814. One volume in-8, contemporary root-edged sheepskin, smooth spine decorated with gilt motifs. Wear, foxing.

[Botany] [Lichenology] ACHARIUS (Erik). Synopsis methodica lichenum, containing all the plants of this natural order that have been discovered, which he arranged according to genera, species, and varieties; defined them with corrected characteristics and distinctions; and illustrated with selected synonyms and observations. Lund, Svanborg and Co., 1814. One volume in-8, contemporary root-edged sheepskin, smooth spine decorated with gilt motifs. Wear, foxing. First edition of this important work on lichenology, by one of the founders of this scientific discipline. Erik Acharius (1757–1819), a Swedish physician and botanist and a student of Linnaeus, is considered the father of modern lichenology. His research profoundly revolutionized the classification of lichens, particularly through the study of their morphological characteristics and reproductive organs. Published four years after his *Lichenographia universalis* (1810), this work offers a methodical synthesis of the genera, species, and varieties known at the time, accompanied by descriptions, synonyms, and botanical observations. A complete copy featuring the engraved portrait of the author on the frontispiece. From the library of Alexis Billiet (1783–1873), Bishop of Maurienne and later Archbishop of Chambéry (heraldic ex libris vignette).