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The results of the three-year survey (2019−2021) of the macromycetes of the “Val Masino - Bagni” Regional Forest, located in the eastern Rhaetian Alps, Bernina Alps subsection, are presented. The geographical, geological, geomorphological, pedological and vegetational characteristics are briefly illustrated. The local weather-climatic conditions were processed on the basis of daily temperature, precipitation and relative humidity data measured in the three-year period 2019-2021 from the nearest ARPA station (Val Masino - San Martino). The survey area, between 1100 and about 1300 m a.s.l., was divided into 11 homogeneous stations for geographical and vegetational characteristics, of which one in beech forest (Habitat EUNIS T18 - Fagus forest on acid soils), four in spruce forests (Habitat EUNIS T31 - Temperate mountain Picea forest), one in pastured clearing (Habitat EUNIS R57 - Herbaceous forest clearing vegetation), four in secondary pastures (Habitat EUNIS R21 - Mesic permanent pasture of lowlands and mountains) and one in anthropized area (dirt road, flowerbeds, parking lots). 

Key words: mycological biodiversity, trophic groups, ERSAF, HMSNMO mycological herbarium, threatened species, assessment of the health status of forest habitats, beech forest.