[in Dutch with English summary: ] Recently a project was started in the village of Leusden, involving the replacement of all streetlamps by new ones. It appeared that over the years the lamp shades of the old ones have become gardens of lichens, and that several species had managed to reach high coverage values (Candelaria concolor 5-25%, Punctelia borreri up to 80%). This is the more astonishing when one considers the fact that until 1990 P. borreri was unknown in the Netherlands and C. concolor was hardly known.