Taxonomy of the Genus Porella (Porellaceae, Marchantiophyta) on the Korean Peninsula

This paper provides a revision of <i>Porella</i> in the Korean Peninsula based mostly on a study of the collections housed in the herbaria of Jeonbuk National University (JNU) using an integrative approach to systematize the liverwort, as well as a study of the types of several species and available literature sources. In total, 17 species were recorded, including six taxa (<i>Porella acutifolia</i> ssp. <i>tosana, P. platyphylla</i>, <i>P. perrottetiana</i>, <i>P. pinnata</i>, <i>P. spinulosa</i>, and <i>P. subobtusa</i>) whose identities were not confirmed with the available materials and were suspected to be recorded by mistake. Two species are described as new to science. <i>Porella koreana</i> sp. <i>nov</i>. is morphologically similar to <i>P. caespitans</i> and <i>P. densifolia</i>; however it has an acute apex, and cells in the middle of the dorsal lobe have convex trigones. <i>Porella chulii</i> sp. nov. is somewhat morphologically similar to <i>P. japonica</i>; however, it has a dorsal leaf lobe margin that is slightly incurved, and the cells in the middle of the dorsal lobe are 20-25 μm in size. Each confirmed species is annotated by morphological descriptions based on available Korean material, data on ecology, its distribution, specimens examined, and illustrations. The identification key for <i>Porella</i> taxa known in Korea is provided.