Verticillium-like fungi within the Sordariomycetes hold significant ecological and economic importance, especially in biocontrol. This study describes two novel species, Leptobacillium gasaense and Ovicillium yunnanense, and provides DNA sequence data and identification keys for the genera Leptobacillium and Ovicillium. The genus Muscodor, known for its considerable biotechnological value, comprises endophytes characterized by sterile mycelia that produce antibiotic volatile organic compounds (VOCs). Historically, the classification of Muscodor has relied on culture characteristics, VOC chemical profiles, and molecular phylogenetic analyses. However, culture characteristics and VOC profiles lack a definitive diagnostic value. Although asexual morphological traits are crucial for genus-level classification, no conidiogenous structures have been observed in Muscodor. Here, we report the asexual morphological characteristics of Muscodor and describe M. coffeanus as a new record in China, supported by both its asexual morphology and molecular phylogenetic evidence.

Fungi produce a wide variety of secondary metabolites, including mycotoxins, antibiotics, and bioactive compounds, which have significant implications for human health and agriculture. These metabolites are synthesized through specialized biosynthetic pathways, which are often organized into gene clusters. Terpenoids, polyketides, non-ribosomal peptides, and hybrid compounds are primary categories of secondary metabolites, each with distinct biological roles. For example, terpenoids, such as deoxynivalenol and helvolic acid, polyketides, such as aflatoxins and lovastatin, and non-ribosomal peptides, such as penicillin G, have diverse applications, including as pharmaceuticals and biocontrol agents. Fungal metabolites also play a crucial role in microbial communication and agricultural pest control. Volatile metabolites released by fungi, including Fusarium and Trichoderma species, can inhibit plant pathogens and promote plant growth, thereby offering potential biocontrol strategies. Furthermore, entomopathogenic fungi produce secondary metabolites with insecticidal properties that facilitate their pathogenicity, including enzymes, toxins, and bioactive compounds. These metabolites have emerged as potential alternatives to synthetic insecticides in sustainable agricultural practices. A growing understanding of fungal secondary metabolites and their applications can contribute to advancements in pharmaceuticals, agriculture, and pest management.

Cordyceps, a genus of ascomycete fungi, are renowned for their medicinal and functional food applications, and are attributed to bioactive compounds such as nucleosides, lipids, saccharides, and amino acids. Among its species, Ophiocordyceps sinensis has significant pharmacological value, impacting multiple organ systems and exhibiting antioxidant and antitumor properties. Although natural populations are limited, artificial cultivation has provided a sustainable source of medicinal products. This study investigated the volatile components of O. sinensis mycelia from five regions, Tibet, Yunnan, Sichuan, Gansu, and Qinghai, using gas chromatography-mass spectrometry (GC-MS) combined with multivariate statistical analysis. Fifty volatile substances were identified, including hydrocarbons, acids, esters, alcohols, phenols, aldehydes, and ketones, with hydrocarbons being the most abundant (60%). Cluster analysis highlighted significant differences in the volatile profiles between populations, with 12 common compounds identified across all regions. Population-specific variations in volatile classes, such as hydrocarbons, acids, and alcohols, were observed, suggesting a composite odor profile for O. sinensis rather than a single characteristic scent. This study provides insights into the chemical diversity of volatile components in O. sinensis, emphasizing the influence of climatic factors and advancing their potential applications in medicinal and functional products.