Abstract: Three new species in the genus Leccinum are described, viz. L. populinum M. Korhonen, L. cerinum M. Korhonen and L. palustre M. Korhonen. Their morphological characters, ecology and distribution in Fennoscandia are discussed. In addition, L. quercinum (Pilát) E.E.Green & Watl., L. aurantiacum (Bull.) Gay, L. versipelle (Fr.) Snell, and L. holopus (Rostk.) Watl. are redescribed with more exact characters, to facilitate comparison with the new species.