Contributions to lichenology

The contributions to this Festschrift mirror current lichenological problems and progress, methods and fields of enquiry. Sophisticated techniques may give exciting results and sometimes solve long-standing questions. However, and this is evident in most articles, much basic research, such as collecting, still remains to be done, expecially of inconspicuous and therefore „unattractive“ crustose lichen species. Only very few parts of the world presently have a somewhat complete inventory of their lichen diversity - a prerequisite of all further students.