[in Dutch with English abstract:] An identification key and overview of the corticolous Bacidia and Bacidina species occurring in The Netherlands is presented. Pictures of the thallus and apothecia are provided for most species, as well as detailed pictures of sections of apothecia and drawings of ascospores. Following the recent paper on Bacidina by Ekman (2023), the occurrence of Bacidina caerulea and Bacidina friesiana in The Netherlands is discussed. Bacidia circumspecta, Bacidia incompta and Bacidina phacodes were discovered on several new growth sites. Bacidia arceutina and Bacidia laurocerasi mainly inhabit young deciduous forests and are currently spreading rapidly.