Language: Italian with bilingual keys and "material and methods" in English and Italian
In the present work 112 specie, 6 varieties and 2 forms belonging to the genus Lactarius, collected in Europe, are described with micrographs, photographs and water-colour plates. Also 25 unpublished colour-plates, concerning 26 species of the genus Lactarius, painted under the supervision of E.M. Fries and preserved in the Swedish Museum of Natural History of Stockholm, are published.