Abstract

Lactifluus (Pers.) Roussel is an ectomycorrhizal genus that was recently recognized to be distinct from the genus Lactarius. To date, 226 Lactifluus species have been reported worldwide. Misidentification of Lactifluus species is common because of intraspecific morphological variation, cryptic diversity, and the limited number of taxonomic keys available. Molecular data are indispensable for species delimitation; a multilocus phylogenetic analysis showed that most Asian Lactifluus species are not conspecific with morphologically similar species present on other continents. In particular, Korea has misused European and North American Lactifluus names. In this study, we evaluated the taxonomy of Lactifluus in Korea using both morphological and multilocus molecular (ITS, nrLSU, rpb1, and rpb2) data. We examined 199 Lactifluus specimens collected between 1980 and 2016, and a total of 24 species across the four Lactifluus subgenera were identified. All Korean species are distinct and clearly separated from European and North American species. Five taxa corresponded to previously described species from Asia and the remaining 19 taxa are confirmed as new species. Herein, we provide keys to the Korean Lactifluus species within their subgenera, molecular phylogenies, a summary of diversity, and detailed description of the new species.

摘要

Lactifluus (Pers.) Roussel 是一种外生菌根属，最近被认为与Lactarius 属不同。迄今为止，全世界已报道了226种Lactifluus。由于种内形态变异、隐秘的多样性和可用的分类学密钥数量有限，Lactifluus物种的错误识别很常见。分子数据对于物种划定是必不可少的；多位点系统发育分析表明，大多数亚洲乳杆菌与其他大陆上存在的形态相似的物种不同。特别是，韩国滥用了欧洲和北美的Lactifluus名称。在这项研究中，我们评估了Lactifluus在韩国使用形态学和多位点分子（ITS、nrLSU、rpb1和rpb2）数据。我们检查了1980 年至 2016 年间收集的199 个Lactifluus标本，并确定了四个Lactifluus亚属中的 24 个物种。所有韩国物种都与欧洲和北美物种截然不同并明显分开。五个分类群对应于先前描述的亚洲物种，其余 19 个分类群被确认为新物种。在此，我们提供了韩国Lactifluus物种在其亚属、分子系统发育、多样性摘要和新物种的详细描述中的关键。