text: Between 1936 and 1940, Japanese chemist and lichenologist Yasuhiko Asahina published a series of papers in the Journal of Japanese Botany detailing the microcrystallization technique. This simple and rapid method allowed for the identification of major metabolites in hundreds of lichen species, contributing significantly to taxonomic research. The technique was introduced to western lichenologists in a 1943 publication by Alexander Evans, and was used regularly until more advanced techniques such as thin-layer chromatography and high-performance liquid chromatography were introduced and integrated into laboratories. Decades of research on the secondary metabolites of lichens culminated in the publication of Identification of Lichen Substances, a 1996 work by Siegfried Huneck and Isao Yoshimura, that summarized analytical data for hundreds of lichen molecules, including images of microcrystals. Ultimately, the microcrystallization method had limitations, as it was unable to detect minor components or analyze complex mixtures of lichen substances. Despite these drawbacks, microcrystallization played a crucial role in the study of correlations between lichen chemistry, morphology, and geographic distribution.