Notes: Most of the isolates in this clade were previously identified as Gibellulopsis nigrescens. However, the neotype of that species falls in a different clade, and therefore, these isolates represent a species distinct from G. nigrescens. This clade harbours the ex-types of Cephalosporium serrae CBS 290.30, G. piscis CBS 892.70 and Verticillium amaranthi CBS 387.35, which were previously considered as synonyms of G. nigrescens (Zare et al. 2007). Since C. serrae is the oldest epithet, we propose G. serrae comb. nov. for the isolates included in this clade. Although the isolates in this clade are genetically heterogeneous we were not able to separate them and we prefer to keep them as a single species until more studies are performed.