Lijiangomyces laojunensis gen. et sp. nov. (Mytilinidiaceae), and Sclerococcum stictae (Dactylosporaceae), a new lichenicolous species from Yunnan, China

<i>Lijiangomyceslaojunensis</i> <b>gen. et sp. nov.</b> and <i>Sclerococcumstictae</i> <b>sp. nov.</b> are reported from China and identified through DNA sequence analyses (LSU, ITS, and <i>tef</i>1-α) and morphological characteristics. Phylogenetic analysis showed that <i>L.laojunensis</i> forms a distinct lineage within Mytilinidiaceae, closely related to the <i>Mytilinidion</i> subclade, leading to the establishment of a new genus within this family. This saprotrophic species grows on the bark of <i>Abiesfabri</i>, often surrounded by the thallus of <i>Pertusaria</i> species. <i>Lijiangomyceslaojunensis</i> is characterized by broadly open, black hysterothecia, clavate asci, and uniseriate, hyaline muriform ascospores. <i>Sclerococcumstictae</i>, a new lichenicolous species, forms a sister clade relationship to a lichenicolous fungus, <i>S.ricasoliae</i>. It was found on the thallus of <i>Sticta</i>, and is characterized by black apothecia, elongate, cylindrical asci, and brown, elliptical, and 1-septate ascospores. Descriptions, illustrations, and phylogenetic analysis results of the new taxa are provided.