Pachysolen is a genus of yeast discovered from sulfite liquor by Boidin and Adzet (1957) and isolated by Wickerham (1970).Wickerham, L. J. 1970. Genus 14. Pachysolen Boidin et Adzet, pp. 448–454. In J. Lodder (ed.), The Yeasts. A taxonomic study, 2nd ed. North-Holland Publishing Co., Amsterdam
The genus is monotypic, containing the single species Pachysolen tannophilus, the first yeast identified to have a high capacity for production of ethanol from xylose.
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