Entoloma subgenus Leptonia in Northwestern Europa—I. Introduction and a revision of its section Leptonia

An introduction is given to the taxonomy of Entoloma subgenus Leptonia, followed by a revision of its section Leptonia. Eleven species are recognized, fully described and illustrated, of which three are new, viz.: Entoloma carbonicola, E. tjallingiorum and E. allochroum.