Taxonomic Study of Hydnoporia in Korea with One New and Two Unrecorded Species

Hydnoporia (Hymenochaeteceae, Hymenochaetales) is a wood-decaying corticioid fungi characterized by brown-colored basidiome, setae, and tiny cylindrical basidiospore. They have various basidiome forms, such as pileate, effused-reflexed, and resupinate. Morphologically, Hydnoporia is similar to Hymenochaete species, which makes it difficult to distinguish between species. Due to its complicated morphological classifications, there have been several taxonomic revisions of the genus Hydnoporia. Recently, Hydnoporia was taxonomically reevaluated by molecular analysis to encompass Hymenochaetopsis, Pseudochaete, and several Hymenochaete species. However, this work was conducted in Europe, which partially covered Hydnoporia species in East Asia. They are mainly distributed in East Asia, but only a few studies have been conducted in Korea. For this reason, new molecular and phylogenetic analyses are required to figure out the diversity of Hydnoporia in Korea. We reidentified all Korean Hydnoporia specimens in Korea University Collection (KUC) and Seoul National University Fungus Collection (SFC) with specimens that were previously identified as Hymenochaete, Hymenochaetopsis, and Pseudochaete. As a result, 38 specimens were selected, and eight species including one new and two unrecorded species were identified based on the molecular analysis using ITS region. In this study, we provided a list of Hydnoporia species in Korea with a phylogenetic tree. Also, we provided macro- and microscopic characteristics to distinguish between species and to support three new and unrecorded species.