Abstract: A new lichen species, Verrucaria squamulosa, is described from saxicolous substrata. It has been found mainly on man-made materials and more rarely in natural habitats in Belgium, Luxemburg and the Netherlands. It is easily distinguished from other species in the genus by its semiglobose involucrellum reaching the base of the perithecia, in combination with a squamulose thallus. Notes on the related V. macrostoma, and V. macrostoma f. furfuracea, including additional characters are given. Keywords: Lichens, Verrucaria, V. squamulosa sp. nova, V. macrostoma, V. macrostoma f. furfuracea, mycoflora of Belgium, Luxemburg and the Netherlands.