A New Lichen-Forming Fungus, , from a Forested Wetland in South Korea, with a Taxonomic Key for Aspicilioid Species of Korea.

Lee is described as a new lichen-forming fungus from a wetland forest, South Korea. The new species is distinguishable from (Fr.) Körb., the most similar species, by the absence of prothallus, black disk without green color in water, olive-brown epihymenium, shorter hymenium, hymenium I + yellowish blue-green, wider paraphysial tips without a vivid pigment, smaller asci, smaller ascospores, and the presence of stictic acid. Molecular analyses employing internal transcribed spacer (ITS) and mitochondrial small subunit (mtSSU) sequences strongly support as a distinct species in the group. A surrogate key is provided to assist in the identification of all 28 aspicilioid species of Korea.