Current knowledge about the non-lichenized genus Chaenothecopsis in Switzerland is reviewed. A characterization of the genus and a key to all accepted European taxa are presented, excluding the little known resinicolous species. The distribution of the 15 Chaenothecopsis species recorded in Switzerland is briefly summarized. Specimens in the herbaria belong mainly to C. pusilla, C. rubescens and C. viridialba; recent collections include rarer species such as C. hospitans, C. ochroleuca, C. retinens and C. tasmanica. It seems that many taxa occur predominantly in montane to subalpine forests in the Northern Prealps, although distributional data are still scarce.
