Contribution to the knowledge of the genus Phacus Dujardin 1841 (Euglenophyceae) in Korea

This paper contains descriptions and illustrations identifying 25 taxa of t he genus Phacus collected from 51 sites of Korean fresh waters. Most of the identified taxa occur in old and stagnant waters, especially natural wetla nds. Five taxa have been rarely reported worldwide: Ph. acuminatus var. iow ensis, Ph. lepocincloides, Ph. manginii, Ph. strongylus and Ph. trimarginat us. Thirteen taxa are first records in Korea: Ph. acuminatus var, iowensis, Ph. brachykentron, Ph. carinatus, Ph. elegans, Ph. lepocincloides, Ph. man ginii, Ph. megapyrenoides, Ph. mirabilis, Ph. obolus, Ph. strongylus, Ph. s uecicus, Ph. trimarginatus and Ph. trypanon. These, in addition to the prev ious recorded Korean Phacus taxa, bring the total number to 35.