This research describes a new species of mushroom found in Thailand and documents two other species found there for the first time. The study focuses on mushrooms in the genus Retiboletus, which are characterized by their unique yellow staining when handled and their network-like pattern on the stem. These mushrooms form important partnerships with certain trees in Thai forests, helping them obtain nutrients. Impacts on everyday life: – Contributes to our understanding of fungal biodiversity in Thailand – Helps mushroom enthusiasts and scientists accurately identify these species – Improves our knowledge of forest ecosystems and tree-fungal relationships – Provides baseline data for future conservation efforts – May lead to discovery of new bioactive compounds, as these mushrooms produce unique chemicals