Boletus chilensis (Boletus chilensis)

Mohamed bin Zayed Species project number 242536089

Looking for the endemic and edible mushroom: Boletus chilensis

This project aims to support the conservation of the endangered mushroom species Boletus chilensis. To achieve this, we will investigate its current distribution, document expert knowledge, and identify key sites for future monitoring. The species is believed to be associated with Nothofagus dombeyi and Nothofagus obliqua, and potential habitats will be explored in areas where these trees are dominant. Initial plans to use participatory mapping with Indigenous communities were reconsidered due to the morphological similarity of B. chilensis with other Boletaceae fungi. Instead, a consultation process was carried out with 22 mycologists from Chile, which resulted in six potential sighting reports and three georeferenced points across Maule, Araucanía, and Los Ríos regions. Based on this, field expeditions were conducted between March and May across seven national parks and forested areas in central and southern Chile. Although no confirmed specimens of B. chilensis were found, other Boletaceae species such as B. putidus, B. loyo, and B. loyita were recorded. New evidence suggests that B. chilensis may have a broader northern distribution than previously thought, particularly in the foothills of the Maule region. In future efforts, field searches will be optimized by following a south-to-north schedule aligned with the fruiting phenology of thermophilic Boletus species. Additionally, the importance of genetically sequencing B. chilensis is emphasized to distinguish it reliably from similar species using morphological traits, KOH, and UV tests. Follow-up searches are planned in Valdivia and surrounding areas, aiming to continue the search for this elusive fungus and contribute to its long-term conservation.