Illustrated descriptions with short discussions are given for 15 Galerina taxa collected in Flanders, northern Belgium. Galerina permixta and G. tundrae are considered to be identical with Galerina lacustris and Galerina marginata, G. unicolor, and G. autumnalis are interpreted as one species. Some encountered forms in this group are presented. Galerina walleyniana spec. nov. is introduced in the marginata-complex. A key to the taxa described in the three volumes is added.