Lichenologische Nebenstunden (lichenological studies after hours) features twenty-seven peer reviewed contributions by 51 authors. The majority of papers have a taxonomic background, both classical and molecular, in accordance to Klaus Kalb's own research interests, covering a wide topical range. One paper seeks to delineate ecological groups of lichens on two species of trees of the Thailand rainforests. Furthermore, papers in this volume describe a number of new species nine of which are named in honour of Klaus Kalb.