Abstract
Desmarestia japonica H. Kawai, T. Hanyuda, D. G. Müller, E. C. Yang, A. F. Peters, & F.C. Küpper (2014: 161) was recently reported in Japan, Korea, and China. In this study, we found intraspecific morphogenetic variation in D. japonica. Morphologically, the new taxonomic entity was characterized by narrow filamentous primary and secondary branches (morphotype 2), which was distinct from the broad (ligulate) branches in the original description of D. japonica (morphotype 1). Korean individuals with morphotype 2 were clearly separated from D. japonica with morphotype 1 in the molecular phylogenetic tree using the mitochondrial cytochrome c oxidase 1 (cox1) gene. Therefore, we propose that this new taxonomic entity be established as Desmarestia japonica subsp. angustifolia subsp. nov. (Phaeophyceae, Desmarestiales) based on its morphological and molecular characteristics.
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