Diversity of soil-borne <i>Gliocladiopsis</i> from Indonesia, Malaysia and Vietnam

<i>Gliocladiopsis</i> comprises a diverse group of soil-borne fungi predominantly found in tropical and subtropical regions of the world. This study investigated <i>Gliocladiopsis</i> strains collected from soil samples across three Southeast Asian countries, namely, Indonesia, Malaysia and Vietnam. Morphological characteristics and multi-gene phylogenetic analyses based on four loci (ITS, <i>TEF1, TUB2</i>, and <i>HIS3</i>) were used to identify the strains. Eleven <i>Gliocladiopsis</i> spp., including a novel taxon, <i>Gliocladiopsis vietnamensis sp. nov</i>., were identified. The six species, <i>G. curvata</i>, <i>G. forsbergii</i>, <i>G. guangdongensis</i>, <i>G. irregularis</i>, <i>G. whileyi</i> and <i>G. wuhanensis</i>, are newly reported in Vietnam, <i>G. curvata</i> in Malaysia, and <i>G. mexicana</i> in Indonesia. This study has significantly expanded the known diversity of <i>Gliocladiopsis</i> in Southeast Asia. The results also suggest that Southeast Asia is a biodiversity hotspot for this genus, highlighting the importance of further research to explore fungal diversity in understudied tropical and subtropical ecosystems. <b>Citation:</b> Pham NQ, Marincowitz S, Crous PW, Wingfield MJ (2025). Diversity of soil-borne <i>Gliocladiopsis</i> from Indonesia, Malaysia and Vietnam. <i>Fungal Systematics and Evolution</i> <b>16</b>: 81-92. doi: 10.3114/fuse.2025.16.6.