It’s the second time that the WBL has visited the protected nature reserves ‘Forest of Aa’ and ‘Kollinten Forest’. The first time was on 2 April 2011 but the results of this excursion were not yet published. In this article together the results of both excursions are presented. The following noteworthy species are discussed in detail: Alyxoria viridipruinosa, Athallia pyracea, Chaenotheca brachypoda, Cladonia cariosa, Macentina stigonemoides, Opegrapha vermicellifera and Physcia tribacioides. Differences between the two excursions are partly due to differences in the prospected biotopes.