The genus Lactarius Pers. (Russulales) is a cosmopolitan group of Basidiomycota that forms ectomycorrhizal relationships primarily with both deciduous and coniferous trees. Although the genus has been well-studied in Europe and North America, only fragmentary researches have been carried out on Asian species. In particular, the distribution of Lactarius species in South Korea is poorly understood due to insufficient morphological descriptions and a lack of DNA sequence data. In addition, the misuse of European and North American names has added to confusion regarding the taxonomy of Asian Lactarius species. In this study, the diversity of Lactarius in South Korea was evaluated by employing both morphological and phylogenetic approaches. A multi-locus phylogenetic analysis of 729 Lactarius specimens collected between 1960 and 2017 was performed using the internal transcribed spacer (ITS) region, partial nuclear ribosomal large subunit (nrLSU), partial second largest subunit of RNA polymerase II (rpb2), and minichromosome maintenance complex component 7 (mcm7). 49 Lactarius species were identified in three Lactarius subgenera: L. subg. Russularia (17 spp.), L. subg. Lactarius (22 spp.), and L. subg. Plinthogalus (10 spp.). Among them, 28 Lactarius species were identified as new to science, while just 17 were previously described Lactarius species. Four of the taxa remain un-named due to paucity of materials. A key to Korean Lactarius species, molecular phylogenies, a summary of diversity, and detailed description are provided.

中文翻译：

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韩国乳杆菌属（Russulales，Basidiomycota）的分类学修订

属乳个人 （Russulales）是担子菌属的世界性群体，主要与落叶树和针叶树形成外生菌根关系。尽管该属已在欧洲和北美得到了很好的研究，但仅对亚洲物种进行过零碎的研究。尤其是，由于形态描述不足和DNA序列数据不足，人们对韩国乳杆菌的分布知之甚少。此外，欧洲和北美名称的误用也加剧了亚洲乳杆菌属物种分类的困惑。在这项研究中，乳杆菌的多样性韩国采用形态学和系统发育方法进行了评估。使用内部转录间隔区（ITS），部分核糖体大亚基（nrLSU），RNA聚合酶II（rpb2）的部分第二大亚基，对1960年至2017年之间收集的729个乳杆菌标本进行了多位系统发育分析。维护复杂组件7（mcm7）。49个乳品种在三个鉴定乳：亚属L. SUBG。Russularia（17种），L. SUBG。乳杆菌（22 spp。）和L. subg。扁桃体（10 spp。）。其中，有28种乳杆菌属物种被确认为科学新手，而以前描述的乳杆菌属物种只有17种。由于缺乏材料，其中四个分类单元仍未命名。提供了韩国乳杆菌属物种的关键，分子系统发育，多样性摘要以及详细说明。